Malicious PDF — malware analysis report

Static analysis result for SHA-256 d706fe67f39d0275…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 05:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d860469b0e91cdb42c739d94cf2ca922 SHA-1: 59d00ebe85bf543a8a27b2de4f38dd3fe3bb6289 SHA-256: d706fe67f39d02750a492ce882710946ccc4b153d960245ced03f6bd8cd62085
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://sclifeguards.com/clients/16854/File/zezusizokajasoxafow.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/savotajevasipar.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/89293855445.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e0cbbab78daf043bbbefccebc8749083/manowetiduw.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160871e0c5fd20---niwasezazusalozuwot.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45b9fe9fe4---20641083801.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160913e2a59c4b---zugip.pdf
    • https://mokhalasati.com/userfiles/files/mifejulasov.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4450972981fad0d90bebac5770546528/ruwafisaf.pdf
    • https://fultoys.com/userfiles/vesonabipufakezepero.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f85dd1218---bufisupajilewose.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd86b8b23---dejuzatikigitiloxel.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f6098bad---54909082135.pdf
    • http://iseveranscopy.com/upload/editor/file/puwipotesu.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/807c1ce6199dc97a986bd20f498f3d0c/86437307379.pdf
    • http://caratow.nl/userfiles/file/89836462470.pdf
    • http://spalovnachemolak.sk/userfiles/file/74180368217.pdf
    • http://transinfosoft.com/userfiles/file/33386962511.pdf
    • http://inter-travel.hu/_user/file/lotonenufilijosag.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ve88v0o2fs2j75lu565kqm70l6/duvojutizuma.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d60d381752d---42647224856.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc22f9df2c---mimalupemesukulisomufi.pdf
    • https://driftwoodcc.com/userfiles/files/13713682013.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=10+scientist+name+and+their+invention
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcf.bin
6965b16bcd5040191f7cc3dc995e46886965c0a5b06dc3b6e8e5a2d4537c621f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 17504 bytes
font_01_sfnt_off00011dbe.bin
f203ebfc81946453083f55c922cd73b0a4e2e93a3ee8668fad310371ece6d6f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 10732 bytes
font_02_sfnt_off00013643.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13643 16792 bytes