Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ee4bd2711689e2…

MALICIOUS

PDF

84.7 KB Created: 2021-07-20 00:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 853d35252ea225e5be7a12e5c8d2ad2b SHA-1: 58d673fbb9e2c43e17b5eec6ef9376ce7760018b SHA-256: 40ee4bd2711689e26c5806ab19e60af2c9cfb1608ddc14042b9db8d46f4da808
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The embedded URLs and link farm structure are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4d84384932c7aa9a43e82a33c18fdb49/75520837190.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073a9ff39bf5---lewuruninazeropawu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/gf9cj3ap8bk043l5lgbslajtmg/waratagozanilafi.pdfIn PDF document text
    • http://pinxedien.net/upload/files/bujidiferaxelezeboxem.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/22790109749.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/88670961795.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/lunaxunetukoriwosaregobo.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/50109648480.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/80764071878.pdfIn PDF document text
    • https://digiconelectronics.com/media/9599460732.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/53734443132.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/991eb8d20b04cbe971d09ec53a1363dd/famejoxuso.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/18573045167.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0585986001624197045.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925cdfc7c33---bafel.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e969b88eb---zoxuwomole.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607153c30b4f5---ziresaxemenesabeta.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d0540e79f64024b8c338eebfef48a99a/nilopapegaran.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/16a037370d4ff372a6661c720dcae945/durakidibug.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/38240411689.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afaae692028---9258178756.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/035kkg0rm9ofofrgj8mbatsh2f/86957730910.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/97140401567.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/bss3kavako4ae0jae1f5aau074/boxegepabivatesajogilotis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sentence+structure+of+present+perfect+continuous+tensePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/622a02e1fc61eb1dcf0f8223efbd8623/bezax.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_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 10440 bytes
SHA-256: 077f322d0de9881f7f9b37d478eee708f75bab8c949777cb8c97d4b79bdff56c
font_02_sfnt_off000117a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A1 17236 bytes
SHA-256: 1e69e452364b8c29bfdc7ef701cbdb777522fc32745cb3b74e3659c1689d82d9

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