Malicious PDF — malware analysis report

Static analysis result for SHA-256 8663c2027855da6d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-04 18:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a6892813fdcb568dc54a211e12a13776 SHA-1: 9344ab05126df2717dce42df09cbe61c75663ba0 SHA-256: 8663c2027855da6d42bf0c2d6dfd2711fe461001350463086cecdaba04e241ce
176 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or tech-support scam. It contains numerous links to potentially compromised websites, suggesting an attempt to redirect users to malicious content or download further payloads. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to prompt the user to make a phone call, a common tactic in callback phishing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sbstroy53.ru/img/files/betojurirelojikara.pdf In PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089131705a47---kadewa.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/02817d8e1a9465afe7746a9b10d0c3e6/72624113951.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/080629442268.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161166ad8ba2a1---vasajiwitoje.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/xapoxoxemiwezogunabafoge.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e3d0481e6---23043164212.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/36579183153.pdfIn PDF document text
    • http://faradbox.pl/files/file/48781717445.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/st30stq3b7nhdo2ug0pvfjjotq/nulanebikevozolimarurovok.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16090640ba8475---sepeniv.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5e45526b29391fbeadf47de6cc4271d8/52104120912.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/4078804638.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d501a87edd---42051349100.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/gigonusefafo.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/sesemerebexovil.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/koguwonu.pdfIn PDF document text
    • http://erpos.sk/data/files/95638248635.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160945b03ac7bd---xerezozazenuvemosamomid.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0m68kpdn2trtrn4k3m3k20e032/fojonirivug.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/38d33dd374707cc5b9711673a387dd69/58737776823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=busqueda+de+empleo+pdfPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/ratevewoputejizetujezil.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_off0000bc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0D 17472 bytes
SHA-256: 4db34e4e72aa24435c82a0c3ec2c810cffd1bf718611dbae8c93f874b3b2a0ff
font_01_sfnt_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 10564 bytes
SHA-256: 32aa72d0503eb0307c3a5c4736da0e99288ccad2c1c3ca4f6084b5b0de6df690
font_02_sfnt_off00010085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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