Malicious PDF — malware analysis report

Static analysis result for SHA-256 924b214d6471bb1b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 19:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bbbd0ca92f03506079993b5ff7285a1b SHA-1: dcf0b068914a05b7ef30398b2cbc3800fcc12da7 SHA-256: 924b214d6471bb1bb15bc5bdf18130f1722d69952053f9e2ea7b3898f6c68a29
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites and appear to be part of a link farm designed to redirect users. The presence of a 'download button' lure and a callback lure suggests a phishing or scam attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=unredact+pdf+file PDF link annotation
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160e60057d3848---63119060631.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/91018841873.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610059dc8b25f---82198047945.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ccb212ab---10678801937.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/71395793015.pdfIn PDF document text
    • https://mvservice.it/file/gopudixefujololitag.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/dirufagi.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba986817295---4589540269.pdfIn PDF document text
    • http://wernitznigg.at/files/tuvux.pdfIn PDF document text
    • https://iaetindia.com/ckfinder/userfiles/files/vibumemim.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdec9a923e4---zivodefovoboxudedimiseki.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210603_E2C9588B0E0FFF23.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160949046564a4---mesizog.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3covjdvbcsajch5g2j6clo6rn2/64456525151.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/lajadutudegig.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/idj50vf6e1srh4gme9lodjq7sp/37491460842.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c08099757a95b4f3b957525945f804a9/bilan.pdfIn PDF document text
    • https://bczenekar.hu/files/file/32649370195.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/23338373223.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/sdqlt00j9tp33sarkasm39r026/27251090662.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e4654730354be6cd14d2078a08240cd7/zawabotogip.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8755e512e---22475875525.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/85329598575.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea18fd4656---45658221208.pdfIn PDF document text
    • 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_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 10332 bytes
SHA-256: a0610e298a61c0b5df22a7266349939abfb25e76daaa82f2d1ce88793b0108d3
font_01_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 17200 bytes
SHA-256: 41f39be1e9e1953ea1d8d7d0b77ebdb1650b1f5d491f52e02332adc60c96cd49

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