Malicious PDF — malware analysis report

Static analysis result for SHA-256 352c457a79b30f05…

MALICIOUS

PDF

88.2 KB Created: 2021-08-11 16:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dfda5f1e407fad2ee390edd6da990bb1 SHA-1: 0158c5e1c464e3abe3343300d394a12abe737ffb SHA-256: 352c457a79b30f05fa7e5b8904e00c33827c598420ed192adbd27f29c6972397
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data T1056.004 Web Browser

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it's a lure for MFA or one-time code harvesting, consistent with credential phishing. It also contains numerous links to potentially compromised WordPress sites, suggesting a distribution mechanism for further payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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) or Microsoft license-boilerplate 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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077009fcbddc---58155995894.pdf In PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/89b5e31d00531945301db3dd556a1a43/17207932667.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/zogefagozokeradu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f34207adf7b---28203316854.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607097729d91f---38660900861.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/34585519654.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2592ee48c7fcc0fbbf00234b2d0466ca/22706777565.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/riwulufedez.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/7s9d61t2rud1erpvvpe90iuc5q/pulisaxan.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4c2a0eca---10143695193.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607abdaf6dc7c---93007983805.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0b05ea2f3ca510c650f821e85caf1cf8/pefowa.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108ed128b9f2---26793916833.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/35fa98bf1517fded6bb2483d3b3de070/dadusarapoxeritipuf.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/86304309215.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d68a9bb032---77816132890.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/25162678127.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-18/20210618215124951686.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/55304111551.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/95412570913.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/99415879758.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc790f437---pibaronowegeximeg.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/15789189334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+change+the+time+on+my+adt+keypadPDF 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_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 17868 bytes
SHA-256: dfbabd409ef76530832c1c168c58829a575600a88d238448192e93c08bebf023
font_01_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 10932 bytes
SHA-256: 08bef9c2f69c30ed40ef075b696a528e0f124c4f2e61e3de0f8ec8c1ab4a0a2d
font_02_sfnt_off00013a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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