Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34b07a5cd68616e…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 06:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d5e7e49b78a11f0a1db2f1b1a9d8f6f SHA-1: f526e34e59926661b8aebaf04f705ffca7533710 SHA-256: e34b07a5cd68616e73c24e3180f9ef0e1c19cf0595eaf2150aa658553d472ce5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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://fetogram.ir/images/upload/files/fejewakuriratewabo.pdf
    • https://icon-studios.com/userfiles/file/10185979655.pdf
    • http://tuanlongland.com/upload/files/romizejejetibumofiwipi.pdf
    • http://miskolciharsona.hu/pictures/file/505570653.pdf
    • https://sunrise-photon.com/upfiles/editor/files/sowor.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/79550188055.pdf
    • http://crystal-lamp.ru/uploads/files/sunojizozovamefumel.pdf
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/95514659977.pdf
    • http://taeguektour.com/FileData/ckfinder/files/20210902_95B2F1B65B898DA1.pdf
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/13720697508.pdf
    • http://hisunnychem.com/upload/files/ralagesefexafamemosibusip.pdf
    • https://srinivasagroup.com/ci/userfiles/files/gixolixixu.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/iamam4uarm2ms65458kiboofpv/19125849462.pdf
    • https://acrgruppe.de/userfiles/file/26254664003.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3fnb765tvn3835nppv10g0j3fh/75914327029.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d883e134dc---22690262047.pdf
    • http://angelofthewinds.net/ckfinder/userfiles/files/pimuwupafitojomajerof.pdf
    • https://inprovitcaribe.com/ckfinder/userfiles/files/98716201033.pdf
    • http://pereplanirovkaoblast.ru/pict/file/38810158874.pdf
    • https://fiscconsulting.com/userfiles/file/pirezopi.pdf
    • http://grancanariacomercio.com/documentos/file/34883172142.pdf
    • http://przedszkolenisko.pl/userfiles/file/vowomi.pdf
    • http://henca.com/files/details/file/42018740614.pdf
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/57074910793.pdf
    • https://lionkingbali.com/uploads/file/99829976484.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+game+booster+play+games+faster+smoother+premium+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2bb.bin
1741eeeaac5b607253dec554c03e625f36775214aacb67f0ee99b921834c1cd5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BB 19508 bytes
font_01_sfnt_off00011550.bin
001369f1664dcbb69312b8145c320a53e8eacbe7dbd21dfc49377613a60cbf0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 11476 bytes
font_02_sfnt_off00012fea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEA 16792 bytes