Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd451159f0267578…

MALICIOUS

PDF

94.1 KB Created: 2021-06-09 00:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4fc50015a83f75e90e97a9f7ef309fb5 SHA-1: 830cf008f2a24c066483d715156f2a88918493f7 SHA-256: fd451159f02675784c7f9b4bcd0b0b3622088faf20fc613fc3ec4b0b0652423e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://irlanc.ru/uplcv?utm_term=how+to+knock+out+a+brontosaurus+ark PDF link annotation
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/51966365397.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2a5485454---67229281957.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6f3465a4fabdee3d570822e2041df768/lobepixogizolezusiduruv.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/mn9b08jichvakda3l2ocoalom6/navilezuxalexoj.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/wunimebuno.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acbe12fa5e---wotujaperonasen.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/14625772535.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s4udt12pdsvtm84jtorcsck0f1/busopilegoxelos.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/95583863654.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kewejad.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b924d3181---xojef.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16217150209605.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/59741683605.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab0a93955d---rokiw.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/suzofutututujopofemilif.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/72993105653.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F9 3312 bytes
SHA-256: 082c89522e4251f0a814862fddf633b1dac669eb780a02580130c1f52bfffe84
font_01_sfnt_off00012eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 5016 bytes
SHA-256: f83d1ec45cf406774969a1f194023769a2c5c4b01b748357270e6d5144e3a76c
font_02_sfnt_off0001400d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400D 13424 bytes
SHA-256: 9faa6c3c4a53658984521fc034cc17780dbf27841d84dc59a2a6b2bd70e58ae0

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