Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fb1c0bbc45df08…

MALICIOUS

PDF

73.7 KB Created: 2021-08-28 04:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cba5b61c4cd943135795629b0648449 SHA-1: af93da9d552a9ec74865b9db2fe6f4cc20892390 SHA-256: 40fb1c0bbc45df088955e7c372a3ea4ac948cb00ce8879f6433ef3ea18ca53a6
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised CMS upload locations, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923f6bebdd3---laxuzarunomexogixul.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62c011f74f---94025411596.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-30/20210530094909732163.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095dc5bbf676---desilivesazubirumaw.pdf
    • http://teormech.ru/teormech/usrimg/file/16097253966.pdf
    • http://kbchina.de/upload/2708221275.pdf
    • https://kingwaterpure.com/ckfinder/userfiles/files/sevexedokegizi.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609719cb7a5bc---56885509784.pdf
    • http://ilcaminodaugo.it/file/86631804213.pdf
    • https://magnificenttreks.com/userfiles/file/pumilugitutava.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbc977ddeb---bejasefi.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/984ec3295f1bc834c7086b6f5f90b613/79028260764.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/97aff4d1f6347cb9edf4e37bf5a5c926/70943733491.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f334e0d1afa---40682927505.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6909bdd359---70638351188.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/47655b4a773f390edf3ed81e42372125/kerilatenoxekoxakowirari.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f80cac41---97647643540.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e36cbbaa---7993383601.pdf
    • http://sun-eko.eu/files/file/mixopujisapipageniwobef.pdf
    • http://tgtech-auto.com/userfiles/file/nekirapun.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081da021f960---75958738400.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd78bc37d9---pujumugarutimuzo.pdf
    • http://barudan.hk/UploadFile/file/20210528100842794.pdf
    • http://mispuntossaga.com/campannas/file/nikemubimoporebijojenezi.pdf
    • https://albizy.com/ckfinder/userfiles/files/69697901717.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=acr+in+urine+test
    • 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_off0000c3c6.bin
568e51ba67ce0e9951ff40765f76fac2c0cc2eef956ccc3d5bec2e554c277b76
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C6 14940 bytes
font_01_sfnt_off0000e9ab.bin
d27b340b0ab7825d8b1094214af6d3a25a2127ef665f4bd346b013e5f1f70293
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 9976 bytes
font_02_sfnt_off0000ffed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 16792 bytes