Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c38c96417d3ea1…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 17:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b7a95b9a2368f92aef6f87ea23d087a SHA-1: 42bbd7161090c7a1a91a145dc42efcbb5c89317a SHA-256: 80c38c96417d3ea1c9677a3a67f69ab6c760fc34b06a7b30d3d5dd14e4dc43f6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and a callback phishing lure. While no scripts were extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • 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://soosekszer.hu/upload/files/sipilotiroputegaxumu.pdf In PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/1c40b90e3c98ef71d69f6e8f20e8d933/rozakapagar.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c2809fa019b---tokopemiroregima.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a69bbf05ff0---fisazeluku.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d0f4c418b---18414365871.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703fc3d0097---xomewep.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/51305116093.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5b9bef975be63ec048d89b95ec15a23d/63642012103.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/xogaxexiwabokopezosigi.pdfIn PDF document text
    • https://brod-plovdiv.com/images/gesevujananow.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/xuvitalorikonuzuvepip.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/pebenewulexulow.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7a71b5a56---30769939575.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4f0b59cf70d74ed8890f8a62047dada5/2641173829.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa3dd8dd88---11899378862.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608605318f656---ribazetopekadak.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/27359551007.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/guzewunam.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/95020743835.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086d7ff435ae---27917897911.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/ligedufibufaso.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/20059422140.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5ea605097---bifatebawapel.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a6c3d062---82373148727.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/17385906054.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/zexasegifefetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=iphone+8+plus+size+compared+to+xrPDF 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_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 11200 bytes
SHA-256: e67a6a87e5ec4e72aa72ac66d0be38eb51e8f916cd06ede42d0f42e693d40e2f
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 18256 bytes
SHA-256: 809ae2f071e5f926c78382bd317d6c4ab04abdd5b82d56e9a1db3bc3388e3940

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