Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63ce428abf9c400…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 01:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03b2ce07c6bb3f2b996e1370e0123e4a SHA-1: edab881f227951250a6e7a96c0e9e2b521fdef0e SHA-256: e63ce428abf9c40013204aef7f6b93fd0ee79312cd45354c78baef9b7ac5528b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is intended to deceive users into downloading a payload. While no scripts were directly extracted, the presence of embedded URLs and the overall structure strongly suggest the PDF acts as a downloader for further malicious content, likely another PDF or executable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.deco-interieure.com/userfiles/file/30040327001.pdf In PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/69481995509.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a93489a604f---xazokabisojijarogokul.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210621_4A285BA582AB0211.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870faf179a2---21380196935.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/megodapipudo.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/kamegi.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7390024b9---51684293266.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5c2641e36160d5d6572ea34bd9993352/lipuxutojuzudip.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/velawuvoximivugowivan.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/6300453026099a59a82388.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/42113063609.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/73016761336.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/72494902671.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/49fc342b840e645f15a12d8ec41de2e3/75065611622.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/jakawogijibiropupowu.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/21325906712.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/99677461017.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/db9bbebd04bf127c0c64e72c9abc4c89/786117476.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/10750806970.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a457df8c97f---24327782430.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/53d29bfb034ab9e1eb7bfd06bded4d8e/1118478462.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106290719473374.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d89eeaa077---75691368603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=transition+words+for+paragraph+startersPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d3935f92af0d86049b0c063f82adfb5d/24534408889.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD053 18840 bytes
SHA-256: c258d8440b12db20503831bd2de12670e04d55e0d9d5d98f0e87180ef58bda44
font_01_sfnt_off00010026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 10780 bytes
SHA-256: aa590e200d47fcc02481ee150c12de4cb47e7667a67e235d194671a48d41d986

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