Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d150db34c0d15f2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 16:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a82a3474bbb1cd5938d4f339d94472d8 SHA-1: 910f012a10f0d8ba20360ca28069953993cd33a8 SHA-256: 4d150db34c0d15f25558a31e1dfc160414a55002bf0a89b8b6155f44acf65317
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely serving as a lure. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's intent is to trick the user into calling a fraudulent phone number, a common tactic in callback phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a1f5f316d---fovoxinanewenekevasusipi.pdf In PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cedf27f637---fazenerivimibukixe.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/kinosesepu.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608114a654851---telore.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e16de2500---67785408147.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/zewavabesit.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/e24gl2vtfsvau2p1ad1cldjtbe/letodolilekaxapepuvos.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/35da70c7a3248e824a659878f9ec1e4c/93553597476.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/kunavovolagida.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/bapamofoworudefonogipamas.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/nojafabufejujaw.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/74872176812.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/82078292070.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/dojinojalixiluxiwijenumil.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/vekalorisitumofu.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/bepobupapobapenudosew.pdfIn PDF document text
    • https://comfort8889.com/upload/files/dewoputibazamatebaxezu.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/96803879116.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/90027910324.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/gujesopaxonib.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/31448577090.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pipenimuwazigivonob.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210808_014512.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/5i6gjb0voaotinqa3shl8bdvq2/vujimorabawesoxura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=beko+tumble+dryer+dcx71100w+manualPDF 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_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 11184 bytes
SHA-256: 0c35895627055d55cb5d0683fd8b1f709b3f57ec94ab363eed4ae2c34fc6a446
font_02_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 18028 bytes
SHA-256: bf30959bf96348b5f2850f1d081b60075f910e40de09b1a8b79213fe7a571771

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