Malicious PDF — malware analysis report

Static analysis result for SHA-256 968f4849c39ff0cf…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 05:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c901f50578a808cd53b4bbec16a6e08d SHA-1: 18cbe834814b067afc449bd48769e9d92639e4eb SHA-256: 968f4849c39ff0cf6971844c4ad6f572014629550f5cfeab07ec716e50404eba
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, indicating a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a300c73118---suletubetadusexofosafe.pdf In PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/30be75d4de8e7b5985eaf4d425015697/66508341637.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/lerepuzizetavarebeviru.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///tagakugiwipu.pdfIn PDF document text
    • http://all-premium.com/user_file/files/14154318008.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/fugidazunoxusovalazuvol.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/40209433754.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135dcb994e38---46682696716.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/kixevisob.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/vivex.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/df71e6b4be8bcc2ddfe52faf03ebbf2a/6666815407.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/30808923706.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/nisofovadunuxefek.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/33072671757.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/4f64a961145bcce74034791ac6bae383/kazulusafi.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210907050745.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/xikafop.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/82679328709.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/nenavemaropixizame.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/76358530097.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/gidas.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/nijumalugozobi.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/tudojezezagojukerevopefo.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/92431640372.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/jipufijerovotexugepitil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=not+getting+usb+notification+androidPDF 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_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 10820 bytes
SHA-256: 83f0fb57317e1c405a250c3b3edbb36620880ffc49380d0b69bc896acbb1c4e2
font_01_sfnt_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 18364 bytes
SHA-256: 0c3a64f845adf9bfa576131f54f7bdd311c9c66640413dfd8ebb79336540e24e
font_02_sfnt_off0001228f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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