Malicious PDF — malware analysis report

Static analysis result for SHA-256 958f890e43bed84b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 14:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb7da10004b16122efcd40d9d0371cc3 SHA-1: d18dd01a3f933e7d54175e45b2243768321e7dbc SHA-256: 958f890e43bed84b0301435e53d7cde3f4989d6fbc14dbd7d052374ade399274
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=company+profile+design+inspiration+pdf PDF link annotation
    • http://isdoor.ru/uploads/files/givamij.pdfIn PDF document text
    • http://wajl.net/img/file/20218445210.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/91631626780.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50c1bce93b---88970110362.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/menorijinifutusebez.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/30371776390.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40699776bf---vikidiwoxafiwoven.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/54836449017.pdfIn PDF document text
    • http://pronobile.de/catalog/file/tuvigofapexumara.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/81290435416.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830a50b806b---92411923807.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/27197788107.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/257656272ba97fd6006fecedfc24224c/43710446258.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/85881276170.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e13bb2eac---28765683367.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/mivob.pdfIn PDF document text
    • https://aitalk.vn/upload/files/devomimedajifew.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/84846646646.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/kafogufofazuputosav.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///pitefutedaboxowif.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/od6l86i6fn641b4b4b2h288o23/pamadizewagabo.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/folekufe.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_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 17084 bytes
SHA-256: ffedb9b70ea3206a2e29e4187181f205d3b65d8f3701f13e867b6bb59093063c
font_01_sfnt_off00010518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2F 10988 bytes
SHA-256: 8520bc0b2395bcf957bedbdeffc8e1c125dfa41ada6e326e5ec4883d58fffa03