Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d80163c4cdeb55…

MALICIOUS

PDF

88.6 KB Created: 2021-07-01 11:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8ef811667f029039365f30ab07209160 SHA-1: fe3b936d1ff76bb3e0f016b6547298ef53d96056 SHA-256: 95d80163c4cdeb55c032ec8fb6c0449effa4993a72646d43d83c69f005ec1939
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://lawina-radom.pl/files/file/31082276363.pdf In PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/82698909802.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075959ba71ff---zabemapasidagunolupipu.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/95967475905.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f194ede1e93af33fcf55013409030985/mijadidipafotoxitijofa.pdfIn PDF document text
    • https://zzhqhi.com/d/files/vonusumepotumekaruk.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a2c3e5f00ee9422fbf702f9af9bb6075/68965651316.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/1bdccfa41dc4108f2e3ea7ae09def16c/belitowibozewazawoju.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/50ajnbpbnqf4l3hhd64h59vfm3/rabewibugajura.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/ranubasodujabinewepenitov.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160811e5e3c6d9---78505062447.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/18289163610.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd223aaf4cabd3c9e2124ce0e7dcbd6e/89197328772.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092bae5484f0---90078154908.pdfIn PDF document text
    • http://aimic.com/userfiles/file/93776637536.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608530fc7fcf8---govutipenare.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/bonosekujinekuzadufite.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a9413cffe---jolixik.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/784771cfac78175cddf9e60dd34b28ef/79974569793.pdfIn PDF document text
    • http://etre-belle.su/images/file/647855809.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/ruruviji.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/48453293447.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160835cfd89e49---36223322398.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/77e6d3f1349f4e9f874329d81de74c3a/78869255835.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/v8626v9a8cjb5ogmlap57jm9s2/pixogenazeb.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe82662c48---39843638478.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/xapalomezerik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+android+free+video+editorPDF 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_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 16560 bytes
SHA-256: 28608b761b2d363eeaad0af11f40acc4b8f1181ffcc12ff8efa961c7237c225d
font_01_sfnt_off00012396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 10420 bytes
SHA-256: 724c68d9e15d033d77a84d7768574da3a6b820f8447d4d15f6c2fd0271b6e6c9
font_02_sfnt_off00013b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1