Malicious PDF — malware analysis report

Static analysis result for SHA-256 812f43b83061da2d…

MALICIOUS

PDF

99.6 KB Created: 2021-07-02 04:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5caca285fb14cb8156e96cb2db41d12d SHA-1: 67c2429bf80f12703c9a054aa2afccc10445d7a5 SHA-256: 812f43b83061da2df3a2fd93e17c01f58143f649a0d84a4921d808aded365754
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://drafthe.ru/uplcv?utm_term=ps3+pkg+to+iso
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608637ef8afd3---43061575634.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/901ed5930fccfcb892975001444ec7e0/kavolosebipadonifinipir.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/dae5dd5fcc10bc6dd52867a561befa54/xekoduwagajuworowit.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5a9d74bb293e3792899ee897724116ae/kovokonusotig.pdf
    • http://amuseonline.com/absite/userfiles/file/65043943158.pdf
    • https://medosojewellery.com/userfiles/files/46216858169.pdf
    • https://szud94.hu/img/sajatfile/files/74566404877.pdf
    • http://www.puhito.hu/uploads/nenubufakubolepijerebava.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5bc7dfee6d24cdc437d47893a72a8031/92181043716.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/91363158f4e206a9e1a6a29e7deefbef/59806530228.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb687ec5627---78308567520.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/lojolo.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a47c29172c6---galerib.pdf
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/berefatogiwepupogofo.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a1587edf3---69014114224.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/99718733601.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/zulevitufapoj.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dcd0d129f---bupuvu.pdf
    • https://businesslife.com/content/file/kolufokovezufosex.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/k125h7k46nokh31oapa9r1cink/14830038337.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/1ad206f43a30025bbf1e4010e2e30848/15271545336.pdf
    • http://madveras.com/ckfinder/userfiles/files/84309780877.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d545781850dd633a3356edf1fd5e0a84/rored.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3ba55eccc85cbe8e441f03aa912213c7/palalimamix.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010be9.bin
79f27ef1bf85ca6c198d098614f2f622ee7798d500390a76c2468bf998b64bfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 16060 bytes
font_01_sfnt_off000120fa.bin
f4b536b4c2758e90ab9dcb45ac95f187ed4b1d6bb2174b720a01249b82ca1e52
pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 10148 bytes
font_02_sfnt_off000137d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137D2 16792 bytes
font_03_sfnt_off00014fe4.bin
3d8dd99fb878f755d2f5dd12810a0f31c88c2bb35ce64d43bb9ecfde4c9fdc5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE4 18160 bytes