Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be1abf2a23967a8…

MALICIOUS

PDF

70.3 KB Created: 2021-06-17 01:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f11d8672f89941faa06a72e8049cd5e0 SHA-1: 5ac9a32041b33eae3ddc7ccefce2df1f4a5f352f SHA-256: 7be1abf2a23967a8b05e44b498fc9ec79ad1fd46de8df386f5132b4bfd17b2f7
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing pages or download further malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8149

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://infrive.ru/uplcv?utm_term=make+my+phone+dark+mode PDF link annotation
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da5bc221c6a6af495a059d6d319072c8/61619933583.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/rezaximabeziwuzegipativ.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/70308569342.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160929816d2652---75165096009.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0427d82c25---sexegisowatuzisinuwedepa.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/xowepapifijiferebumap.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160776ee49bbd5---34601596627.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090aa7706ded---rogok.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/783b7e8f7cfc3b1e5ff4dd5d31df5d24/48808956317.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160960b1b1ab39---81376544159.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/18414655892.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6e556nid5i849o07ggtspdoa96/91004528501.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/ganexetatomigub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 5160 bytes
SHA-256: 31a7a6423a81a95ff8780fe8cbd4dc6af36a7c0b2cfb212fbe0d405d7be66edb

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