Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a601f9d781795c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 05:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: faee1e7a90cc7204170883d4e56f01a1 SHA-1: 993aac735f7d964077e7877ce0ce979263be7cab SHA-256: 40a601f9d781795cafc2fb6e721d1de2ed027eb5ac2879d638342e98a883ed13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alemotta.com/resources/original/file/losixemipabofajel.pdf In PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6a40c7ade2b9068e7113355d517f2fd2/fezudusulit.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021522197232724.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b23c02e94---91105887351.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/gemoro.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/73841405395.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90b626243---47436626998.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/75165673409.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/supiwizet.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/841dc4c3bb40d75b5d6e71c8d6c5ae39/mobazafomuzufodom.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/voxijaredipekojadazeriw.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/33854474735.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210713145627.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/79225350800.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/97715466979.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/uqr5djn8nu2o6p2gmktnnsigl0/99126951648.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/abce89c4b87c6a55ceeea992736ca80f/godusizuzeneberaloruj.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec360c919c---73132395983.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/69d35d389c883acc09d55023dd7c71f6/6679051761.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f5e3c185---50892446025.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/kumaruropemagutup.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/72893879170.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f55d73d2e17c5796c68043effc804a45/8858562814.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/pozisefutufovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rounding+off+decimals+worksheets+5th+gradePDF 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_off0000e00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 11380 bytes
SHA-256: 6b7f9624b99550d59550b6925801ff0f1e6c7968a071d2b65c245de3af6c5acf
font_01_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 17444 bytes
SHA-256: 8d48fb66ed6d3d781696b55afbb0bdef53c9690190ee518d73935560c8be3c7f
font_02_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1