Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8e36950b47b255…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 11:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 124e41e8fd7a61d7ab699dfaa4efbb5e SHA-1: eccc0f83477e8ba050879bc9413f2b8320c01bdc SHA-256: cb8e36950b47b255c2c9588a310fd079accfa127ff9694fb8e49fa8804cc99ef
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://kedehg.com/ckfinder/userfiles/files/82160210114.pdf In PDF document text
    • http://vejwun.cz/images/dopudetudef.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a9b1773a4ab844b167591105ff26d3b6/8363282797.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/48518033950.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/velezoferutomifagi.pdfIn PDF document text
    • https://p87.hu/files/mujubema.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/066d0601264bf067d89d4926e24bd4f5/30227240380.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/jezakumujonapuwawewusaka.pdfIn PDF document text
    • https://85097781.com/upload/files/55755394312.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fe2e33d0f---33033814150.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c4aa85b2c0bef8c79d985eb89856f87b/99123371635.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/latixuvu.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/zupor.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a83406a956f---zonil.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9ba9f13e0---kuxulujoneliramugawet.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/36141914233.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1613d767f9b4a01942a8a733cd65ae3e/13448792716.pdfIn PDF document text
    • http://kotolantopeni.cz/file/zibisosadorepitemopop.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/nixedizuzed.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160983bdecaec7---14531924818.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8eb0275319ff6111c0503cb931cf446f/pimokoromexi.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/kgv0ahon7p6ggk5rpo1h67rv52/bawipuwimegiribepifuvatik.pdfIn PDF document text
    • https://campermagazine.tv/public/file/zaxuzake.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/vinikisuras.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/20369616388.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/abb1a632e1cf01ed18a882bc858583d5/digufasorufezebudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+poverty+of+historicism+popper+pdfPDF 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_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 17892 bytes
SHA-256: edc75fc486fcfa7067f0164b23a78299b90f2608a896b7f06e945335d87c0330
font_01_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 10716 bytes
SHA-256: ce2dbda805bf9d952a1d0f6b4a4afb09897e82efcaf3c7b4cbec8b67bee914d9
font_02_sfnt_off00013863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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