Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c1367cedf8d8d8…

MALICIOUS

PDF

95.5 KB Created: 2021-09-20 21:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7301f1d8c9e66147f49d03c5e5ad75b8 SHA-1: cda8918807a314067113b016413e4820f05ca590 SHA-256: 89c1367cedf8d8d89c6986d06b1478c69f5f5b1291d300f9eaedefbcc6f2e4e2
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external PDFs hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting, suggesting a link farm for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. No scripts were extracted, but the presence of multiple external URLs points to a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://ketchas.ru/uplcv?utm_term=juegos+ppsspp+android+mega PDF link annotation
    • http://abovomedia.hu/_user/file/48859944979.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/wobudurofe.pdfIn PDF document text
    • https://airbays.com/userfiles/file/fawejafaraxonideg.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/zurupemupibew.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143990e6b0a0---2030977611.pdfIn PDF document text
    • http://salespate.com/userfiles/file/dudom.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/pumudamuza.pdfIn PDF document text
    • http://kleiberit.ru/files/file/tesumagosaneduk.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/87583249956.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/xurabanorolafozazudevu.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/94242021434.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/mogase.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148122588062---241533779.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/37194682567.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613618a5d7a81---52680313221.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/3801398808.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/gokal.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/90716061931.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/lebujarujiwepijok.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/lixejif.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/93313066729.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/numisibepaxokasu.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/dunuma.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/murunexevutivunan.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/pajabosavenuj.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_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 10680 bytes
SHA-256: 4b68a730928f4a95ccce2d017c90c532e68910ae7f18841344d38d59fd8f588f
font_02_sfnt_off00013b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3C 20276 bytes
SHA-256: 6c48a2d742bb8e25cdf2e7cbb33b0df7a47eb5f36ca1aa629210bd211e8c747c

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