Malicious PDF — malware analysis report

Static analysis result for SHA-256 041ca7bf0225e343…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 05:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5c798e1b30129326944f882cee42d82 SHA-1: 2fbc68ca6de5cb86822a709cf553a912c2877ddd SHA-256: 041ca7bf0225e343b01a3232f7515a0979fe07f0b6f95b2cc04b3c4127f034a8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised CMS upload directories suggests an attempt to obscure the true destination or leverage existing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://philabc.ru/uplcv?utm_term=poema+la+vida+es+sue%C3%B1o+pdf PDF link annotation
    • http://benrassam.com/uploads/files/73929420802.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/64mrnsuc8q7fh18mhg2n4je7gm/14394272679.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/pujemijuvijexaxinabe.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tajalolur.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/kumavibejebuxonopotelig.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/bevimu.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/q89cooe0nrn260o1c6h45mj9k1/77802920055.pdfIn PDF document text
    • https://2acontractor.it/images/file/fisusisamavumaxed.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/387fb1ccf1464d93609bde827f7894db/vadafexatokewebegubuzukip.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/sebekexorapemofubow.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/kesuvakitigube.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e91dc9dd66b---24336845476.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/5111767233.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/xevilep.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/pevisapuzijeru.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/pvpmchdhaue33qa4fk7668m317/70347777405.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/75166890175.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/bovepitivabosuzime.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/zuteribezuxax.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/fovefof.pdfIn PDF document text
    • http://hjhchem.com/upload/files/xekoxo.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/xozuruwazanojumaron.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93d6b08226---83666251293.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pdop6ntrtfp50e2uglllodpf2u/kolezixurewapovaxug.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9890374198---gaduwetesuwogurufal.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210825202017.pdfIn 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://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_off0000d168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD168 19192 bytes
SHA-256: d091c45468f57eab03a5bd5536958a799ba6d1981c20963df5580b2f55681aab
font_01_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 10732 bytes
SHA-256: 93d713ab90e66dd3bd7d554b8b2b92b68810ac549542829b663df059fb66fb9c
font_02_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1