Malicious PDF — malware analysis report

Static analysis result for SHA-256 e29757d99c1b2900…

MALICIOUS

PDF

77.6 KB Created: 2021-08-31 19:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57516b938a63db129aeca1a2da65e9fa SHA-1: 5984d66f630a0c015d59bb51cc71581c631bc836 SHA-256: e29757d99c1b2900dbad1a6d4d3ea152d3504351f2830e8e40ee70c19bad7647
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or scam lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://trungtamgiasuhcmmq.com/uplaod/quangtri/files/76138850242.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ef44d95c2bd5722760ba91ddf099c4b9/99321337641.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/74dd212b997a92d91d36ed853e8f76c4/luwuxudirorofunura.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/wuvebejevetirozaveminuge.pdfIn PDF document text
    • https://iword.de/userfiles/file/pisavezu.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/96439347251.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/56297716524.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/tozodutarew.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/10018557546.pdfIn PDF document text
    • http://rilta.net/userfiles/files/vixifalibose.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/sevaxijufawoli.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/aa87653e817491a75bf188ea06b42f77/weginalikekenosivuriw.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a441384aee7---31751480084.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8158899a44---sumukekegosokow.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/80821143309.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jdi8q2onm3nfoa09s59ucl1d0o/xunabepewodufosudoxof.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/xunamumezuj.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/62795520020.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160795a04e7f42---6958928767.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/q3bhghdpisclddinpka1orsv99/runevopitufepi.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/pemogawodomiligano.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b81177271c0---79363545195.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/89961801016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cannot+download+pdf+on+iphonePDF 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_off0000cb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB25 10444 bytes
SHA-256: 8454bad5aeb5bb223815a14179df510a5fe0a77a7e947462604117a38b65d9cf
font_01_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 17520 bytes
SHA-256: 5f7fa5bc00d3c9c1811280f746c8149b68f76f2aeb5b032bf0713a3b3e4e9b5d
font_02_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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