Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac726a96e5e557f0…

MALICIOUS

PDF

89.8 KB Created: 2021-06-28 00:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 779f323468a34213deffd22fcba0a772 SHA-1: 563e71a72fd67826926cf63db10a6f21ba15fb81 SHA-256: ac726a96e5e557f0252ae69718ac1832d09adf68d323254d5f481ded485e867c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://jinohair.com/upload/files/8084765825.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/904a8b89143bb9c0625ad6a27357d31c/fibosasijitexupog.pdf
    • https://hzautomatisering.nl/userfiles/file/82507422734.pdf
    • https://stallion-international.com/userfiles/file/tatosi.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/720ed645ed4370b3c23759e932e83b96/6924509265.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/24d31092c19b600c492f55fda4aa359b/85718354694.pdf
    • http://grandinspirations.com/clients/75274/File/rofefiboj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61bd7e7359---340415142.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16073bed000c0c---36024112575.pdf
    • http://rgn2u.com/userfiles/files/bopobilarumujowezujodola.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/merudifub.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/e07l40rlsc3osectf1v3joopad/77198685868.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/8e074a3f02ec6f94efb1ed13d573be7a/meduduzegeporedorur.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/gufabidezuzobox.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab7d4299f3---24729366806.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c488293d20c---mosileverefaxuzipufiz.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608939af0aae6---naroziforifijezasip.pdf
    • https://obermeyer-modemarkt.de/upload/file/gujubituzawidudupixi.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b918a9cea9f---degefowoligadeferulemu.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af91aa767b6---78971500548.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/5c7bed090eb7c97baca5c1398eba53aa/24966085889.pdf
    • https://jjcfurnituremaker.com/userfiles/files/dudefipuzegivuxi.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd76af4749b---46075624646.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=a+quiet+place+monster
    • 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_off0000fb1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 16792 bytes
font_01_sfnt_off00011332.bin
7fc075d71d00c1b8114e989eb7000086fffaefd490fc6f4bd4c43efb0e19210d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 10760 bytes
font_02_sfnt_off00012beb.bin
ba0f7e2fb2ad1df33f3c2d209a2979b27033e633c2ba5d1e4e38d2ade839eccc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEB 17736 bytes