Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55cb239fa2a7ea4…

MALICIOUS

PDF

85.2 KB Created: 2021-07-12 23:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 185a39524148c1d9d882a67198640244 SHA-1: fff35a427f330a91778d1f43e8aee84676462c4a SHA-256: f55cb239fa2a7ea484303ca5d56b09cb0df6a9aade1818443a44272a4b23d219
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains a link farm pointing to numerous external URLs, many hosted on compromised websites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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
  • 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://sodrex.pl/userfiles/file/34636648363.pdf In PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/bodimobitivaki.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dc65814e1---xezazuwifipiliwed.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/87812048771.pdfIn PDF document text
    • http://clarasonic.com/upload/file/95203264374.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/83634256633.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f1ec5f1aef---tejadobes.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/005fb78d59742d370d8c64df3f417cf7/fasewalitaja.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160742331aa1f0---xoxirafuzosisik.pdfIn PDF document text
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/86dc61e6c70e0a85199434a0cc37cb1e/15613890319.pdfIn PDF document text
    • http://sooclose.eu/upload/File/21618665882.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/t08pel902j0m5afv5kssajm785/54032516038.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/womowejurazeginunaneb.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/fupanoboboxuxefujorire.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/46052329352.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210621012842_btx3r2.pdfIn PDF document text
    • https://penal-garazh.ru/files/gitikavebazuxowiralikurir.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ae018e69---83220537983.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/41842714617.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc2154d0ba---supolejowaxirixe.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72c17493b---xoduwajepaw.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/zogutozezodutakebesajup.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1b14993753548f27766e1cbff9d6af2b/19532309156.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd6a1e299---15865270057.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c1446294970---65607730008.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a418a6443e1---47902021761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=assassin%27s+creed+3+savegamePDF 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_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 10704 bytes
SHA-256: a6a9aa8f883533f0269929597b5495fb89bd9a2328d4fd177e31154b73f97fac
font_01_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 17372 bytes
SHA-256: d2db7ad12a25d523985bdb8baf7fd0140f9cb82e854a090284ff3e0f1065cc27
font_02_sfnt_off00012de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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