Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4918ff77985af9…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 09:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d5ea1479c7273b4d5b92ee48d513512 SHA-1: 75b7b5fe155b5f52d4a3ac54bc632083e534500a SHA-256: 2c4918ff77985af918bb003a4566624483cc7cfa8bc6ec44ecc2aa9aa9f2332d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of PDF link farm heuristics and embedded URLs suggests an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kijadunadexaviveferib.pdf In PDF document text
    • http://csc010.com/userfiles/file/20210808212512_12z1m5.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/xorevavabi.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/tudizakugemezoki.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/binenezes.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/soloxakiza.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bbb9c1b58c8daba173fc25cdf6fe1265/zupojiluserisove.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/86730255295.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/jepufevevaluvurosobago.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/92940113524.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/69350251432.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/46e935489357d72b8f70e5f7dbbd05df/62075763798.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/lajomaji.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/adce829e63211c0e320564220e085bc9/34201144178.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/189d5aefad4ff1d12fd5931dca3ec2c6/fofuk.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210623_163805.pdfIn PDF document text
    • http://otczenacts.com/media/files/sebetuvanejulatopewit.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/wovomexakinowugezezegon.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/58714751387.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/45416673846.pdfIn PDF document text
    • http://erex.hu/upload/file/fopetevenavotame.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/rorakilubukijuroxedelup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=calculus+vol+2+apostol+pdfPDF 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_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 10500 bytes
SHA-256: 4d45fb38889141c307fd411e7c4ac2d6454e6c94678cd43ba31860c1a6fef66d
font_01_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 20080 bytes
SHA-256: 9a075cf9b8e1952296022ed1aecdee2757e2202eb2ea3bd39de0d14e2bd2b348
font_02_sfnt_off0001303a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1