Malicious PDF — malware analysis report

Static analysis result for SHA-256 d196d507b496375d…

MALICIOUS

PDF

168.0 KB Created: 2021-09-08 06:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ab802eee3e57e4de8e0f5f3781c8656f SHA-1: c00f2218319b74ed5ecfddf11dbcb87da46da6e6 SHA-256: d196d507b496375d8b5a3ea9593be10066c7b8eec7b82bfcb54f7831cfc67162
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and the link farm structure indicate a lure designed to lead users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • 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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/0928ec7f0ec8a0158be115f39c2d216f/10555366210.pdf In PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f52009d94e---96409167733.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/pivipelurezirojozep.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075dde88ec8e---86065388672.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3c5852686067266a3324870663cb35b3/kotute.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/gezedudap.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c86aca5cf3ddeb2dc310d393226893e5/48713523932.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/libusonowosufusibo.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/26882165380.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ff87ad81---86569642427.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/74156b89840c411201a31b2f12560541/37230701822.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/9851252145.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/78325430093.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/33bbb78086f4247700b1a01ccf1ede73/48278186137.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9154b45840---burakobabaruxipakevow.pdfIn PDF document text
    • http://megalaserasia.com/upload///19450565326.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b14a0716e1---11774993072.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/91199929264.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/jigaj.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b039b598285a415032ce96bae6c71f7f/9025598223.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/14408317589.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/87581458367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=motif+xf8+manual+espa%C3%B1olPDF 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_off00022641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E58 11028 bytes
SHA-256: 8b987e0ead29b45540838430921ca85437bdcdd20bb7dcda3d0847d2bd30af47
font_02_sfnt_off000257cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x257CF 21680 bytes
SHA-256: 88a7544200cd91e2771b8933f5048a0bf3da3947f1b57f8f45c8a886e3423433

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