Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f59bb295372434…

MALICIOUS

PDF

73.2 KB Created: 2021-09-27 23:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a497ec7c57b4e6f8add68d9e2da8807a SHA-1: 7eb21feafc73c50d6f655b609e67cb5321035174 SHA-256: f3f59bb29537243414b5c067e9b8e26639b782a6ed3411e2617143c1954af707
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is a phone number lure, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ML classification and ClamAV detection, strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=transfer+all+data+to+new+android PDF link annotation
    • http://architettotoma.it/userfiles/files/dipeluridez.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fimfbf1tv1nvonkt6svi6aief4/54175212195.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/zizagamobog.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xejawas.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e12f2d6e23525d99d70fec5a3cf03cc9/78474639989.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/42921509604.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/87852497360.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/fuwofusewolukoroxi.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/memibolanobituw.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/jejifixoxumajitoja.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/82237533348.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/67007196676.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/11633322562.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/rilixusuw.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/746466238613c3ad2aaa15.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7916ef22d0132c9bf6b2d67f8ed019a1/kobexavafifepumiwenamerub.pdfIn PDF document text
    • http://vititanon.com/user_img/files/mipowanedo.pdfIn PDF document text
    • http://ahchala.com/img/file/gisomokokujeweletaw.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f03fa338d4d2e0abe857995e07109e3f/kexuwubuxazeragenele.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/soropirude.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/dunujalezizugunubofozudet.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/laminitof.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/71273396400.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_off0000b88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 18472 bytes
SHA-256: 279299981a8d60b3413e0ca93e67430c96eccf6cabeffa0873da707c841e9613
font_02_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 10396 bytes
SHA-256: 4c3d14dcee70e6066771cd75a9d47d70bd16f3416e7898b364289fa097e6af1f

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