Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c61ccd3a710aadd…

MALICIOUS

PDF

82.0 KB Created: 2021-08-17 09:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f5bbd5eea5243cdbfbe268852ffcc73 SHA-1: c3a730d3c0b8872c6eeecda541bd445c82e55367 SHA-256: 4c61ccd3a710aaddcb9f967197f67e4bb1e2dca9a342c14b786cd1bc25eeb148
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to external malicious sites. The ClamAV detection and ML classifier further confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=how+often+should+i+feed+my+half+moon+betta+fish PDF link annotation
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/cc6e9c5fbd7983fb45a36468108d757f/fuzanavewowajenetedosifi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/11792971931.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/2413110913.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/gixasozuwafugov.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/d3db1f20ed949e3213a697f623e1af91/zevoge.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fde6a120a---92954301091.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/477275877.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/13199862651.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/polodebekuluwazujesufu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/boxejo.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/deweledobetiwiwisu.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210704_82D68838B4E106CB.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/de4ef4b466047feb3a37c06edfd4258a/3437354073.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe26df14007---nudagaxakukimij.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072558d8d45b---nokolegemelav.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4961e9b3cc---jupebolaf.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e3747f3525fc89ffd50704054065a901/badelonujabivazemedixul.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/fuvozodetabaruvonexi.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/vagogalos.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/85076113510.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a7e98dfe8---vegupugenavezu.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/jobowokorejukenubebubopi.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/lolelesabel.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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 16524 bytes
SHA-256: d548f157cb0aeb04590560202f6e1a8918740d8c4371dab95f53b366f77215fa
font_01_sfnt_off00010899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 10948 bytes
SHA-256: 801d89170a25849a4b6fbdc7eb0833ef781f5dc41f4683b8b263251a67b1364b
font_02_sfnt_off000121d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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