Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad34040a92533f59…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 21:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0cef5ec630fb210b17a47199a2dc43f7 SHA-1: 6edd0a4156383d5fb295b9cd09748db845a8bd49 SHA-256: ad34040a92533f598fd02548b80e870c83736472e5078033e1f055c92dc919ad
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple links pointing to potentially compromised WordPress upload directories and disposable hosting. The presence of a callback lure heuristic suggests the document is designed to trick users into contacting a malicious entity, likely to facilitate further compromise or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://corpusbg.com/files/fck/file/75410013622.pdf In PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04a88c03ab---rakamokugisedibibiriwigo.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/vufitikalosi.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094267a70db8---fulajegalonimukinani.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/64701885309.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/13029446030.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e21c0a06b3a---ponekitegexu.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161173a825638b---pirazowumezuvanud.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4cff2620f---10868784973.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/93709341592.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/jejidosufanujofarunisa.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/wafoj.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118df8027216---baradewulerarap.pdfIn PDF document text
    • http://trovas.com/userimages/bakeloru.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/86725639309.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/3757fbff88388c0b6daa3da6e781b889/78251211070.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5dae3f5072ff84315924bf9225715954/rarekujisafebadagedosalo.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/rulox.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c62dde6a511b530512e286a20db18918/nuduvuvubumugijesuje.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/ravuvusujugamazuwor.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a672af93ff3---69215702808.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f5428a90b4ebf698d01b2728617e9d52/3724448179.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/givaxiwebafakulelalibel.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/zusufebitepizuxevonawil.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29a840d89---pevedisusoginifagomexeg.pdfPDF link annotation
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d69ced68b26---keraleb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=white+rose+cpdPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 18144 bytes
SHA-256: cc074e105cb1a6c7826fec89bf82f0e905962a58cf0fc67dd772ff784a1f6920
font_01_sfnt_off00011c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13443 10292 bytes
SHA-256: 56a770011b6e63c8b65b9aa58668f7d384a7706180f8fc9022918cd3137ab1ae

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