Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb4c3f4bb597ea7…

MALICIOUS

PDF

77.3 KB Created: 2021-09-19 00:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 314a8acf1f1c315b8ac1155b61116722 SHA-1: 26af771341bf1e59ecb995e6af6242fc4706f490 SHA-256: 0bb4c3f4bb597ea72412e17570eecf7ebbb8f4976e3791eda86c24423112353e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, some pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a callback lure heuristic suggests the document's purpose is to trick the user into a phone-based scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://benevolo.it/userfiles/files/56252237335.pdf In PDF document text
    • http://apcmagon.com/userfiles/negukelojizagifagig.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/52279809064.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/395b253a1d989b8d256310e77a983dd4/lefenavajopi.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/sakaj.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/xovelodekala.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/mubanulosesof.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/10377313558.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/mawoba.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d87898f8d---gazevufusibuzanefojen.pdfIn PDF document text
    • https://remini.hu/userfiles/file/59244389100.pdfIn PDF document text
    • http://ndt-ultratech.com/files/13641785978.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/vivotodedadetuzedelus.pdfIn PDF document text
    • http://freetds.net/userfiles/file/bituvoma.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/nomige.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/gozegipesekun.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d4c3b0d7e---21905721491.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/wizogidepa.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/zajutexepekume.pdfPDF link annotation
    • http://abwrichmond.com/uploads/files/silufipivodavuxenavusin.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kls24phphapc4k1eld2i8mit80/fegojetozubexered.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/57646252822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=run+android+apps+on+tabletPDF 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_off0000cc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 10672 bytes
SHA-256: 11e73cb66d709e30c46ed188c909489fe8827ec0fcb29b7ee71b7473b18f8a50
font_02_sfnt_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 16800 bytes
SHA-256: 6ff6872c3e7bae12421c6f6a369573445935abbe430820c7164056a64e66863a

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