Malicious PDF — malware analysis report

Static analysis result for SHA-256 22591660a8c7db17…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 19:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 660c681c0573666bc27053d201db815b SHA-1: 91a04bb236eb7eabbed549d7faf07ab88b0f87db SHA-256: 22591660a8c7db172558dcdaefd9259945224aa8e5fa0a3b2ac7962988c4f66c
224 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress upload directories, indicative of a phishing or redirection lure. The heuristic firings for 'SE_PAYMENT_REDIRECT_LURE' and 'SE_CALLBACK_LURE' strongly suggest the document is designed to trick users into changing payment details or calling a fraudulent support number. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161348afe9df4a---nibiwinajasofidola.pdf In PDF document text
    • http://smartvoicecom.com/userfiles/dalim.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/96240308161.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/66461015676.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/10578983594.pdfIn PDF document text
    • http://newo.ru/files/files/67741179817.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/75460401648.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/dowev.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/66983189609.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/soxamexak.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/40012550579.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/14463596349.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/xolazazejiniwasovof.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/54522534113.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134db4ac37d1---39242782444.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/retogolosisokenutirure.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/vuwiv.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/zafiva.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/48609826422.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/82668237553.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/tapenamavovinolanunov.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613814263d624---76428491807.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/jijokekilukevatatisol.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109070908309552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cash+app+hack+apk+2021PDF 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_off0000dcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 10196 bytes
SHA-256: fed2be7ac97539fbd26fda577d9140fd9fa01d115a10c39d09ad0fc13c963945
font_02_sfnt_off00010bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 18052 bytes
SHA-256: 865782c2ba6f2a618242fcd5970ffbc0e2f3fa37232fdc4fad3dce5eb6629dc4

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