Malicious PDF — malware analysis report

Static analysis result for SHA-256 329abf43fffa34dd…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 07:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e82eb45f8a911f489920c1309cb8deac SHA-1: edcffda32665ed88f7c0cb42be7c94bbbe5e3970 SHA-256: 329abf43fffa34ddb9bb9b628ec8cfb7f60b2189c9d71376bebccc72d6bc214a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised websites hosted on disposable domains. The embedded URLs, such as http://www.drop-lok.com/..., suggest an attempt to host malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://1mosref.ru/ckfinder/userfiles/files/tamezunotiwusaxasopufinud.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c84c9686b---59634810984.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/7682036690.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/mobevesez.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/26087is62lqo3qa3oqigodkb23/75604565405.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/33049036688.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/mivonaw.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/38365640176.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140300adc511---19189635312.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/45539748556.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/51426816177.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/goguzerekeduv.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/74935893118.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/5egpoq901refb7o6np2kgl9f06/7118082550.pdfIn PDF document text
    • http://surestegc.org/documentos/file/xedubimod.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/nunapisudageg.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210902_4E03B8732CE66CA6.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210917103253.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/kopekefezowupipufud.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/40018051180.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/91374579140.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/14340434510.pdfIn PDF document text
    • http://cloverdiamond.com/file/4547101561.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/62387435570.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/97018450068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=new+strange+vpn+apkPDF 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_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 10392 bytes
SHA-256: 68d49057fbb0ea2bb00c20cd07b7b04907ce702f4628ac6af34a38fd5ff4a5b6
font_01_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 17644 bytes
SHA-256: b85050e7367011fe21c4caccc71a3350b91938a4d3a8692770e3b510552ec74b