Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc36bd84e831f0d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 17:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67f68c8b17f686f85841427cba667bd1 SHA-1: 6f1027817b34b4f7d3688e5de0e7fc2ac980b85a SHA-256: 6bc36bd84e831f0dc29916abc0d37d9a7b4f57b3ca1f856d55f1fdb691a4d14e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing scam. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to host malicious content or redirect users. The document body, though heavily obfuscated, likely contains the lure text prompting the user to call a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://pierrelemagicien.com/userfiles/file/27242970064.pdf In PDF document text
    • http://patanamachine.com/imgUpload/files/jopupovavutuduza.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109102203196138.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/nezapaz.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/woxupuba.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/sokixojukebosixagakaji.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/weguvakijemege.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abea6efc76---jivoworufekite.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210905_10_52_55.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/23825681869.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/91608882501.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/10551228055.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/013bbecc19e012297b7f19f520987f9d/46252506910.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/88502091729.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/11181809547.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/63057071271.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/laketumofug.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b12d6d5a7---weduzopivegibukudezupo.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/72880478423.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/79317834660.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/fffcf763ebf4bf69a6e0327d5bd71357/41562641892.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/19884573959.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/nomudaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=find+downloads+on+android+phonePDF 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_off0000d4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 10452 bytes
SHA-256: 649223b662c9466cb5cc4a4498dcaea835b6804d2471bd427e73a0256aee1a92
font_02_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 18112 bytes
SHA-256: 1bb7ce714a8a21c4d2292a563b14fce3278cacd9c386aac590ccc9c7fddb39f4

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