Malicious PDF — malware analysis report

Static analysis result for SHA-256 682d91d48406b82e…

MALICIOUS

PDF

87.8 KB Created: 2021-07-07 01:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 109599d187f7897f909f3c7a5205bd86 SHA-1: 6f45579018e1ced77a56fdb3302cd3aef1f5e2fa SHA-256: 682d91d48406b82ed9ab4cd4f8b476954764fe2a045285c22ca2bb9472b21638
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the ultimate destination. The presence of embedded URLs and the nature of the heuristics indicate the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://kinel-hunter.ru/upfiles/file/zipivivexijeponi.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/08cd9a7839d399f8e79b6160862412a7/27831753646.pdf
    • http://acecaalcoy.com/userfiles/file/21120053412.pdf
    • http://alkanboya.com/files/file///sebaru.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/eb5ebc0qc301m5chc07fsjb4q3/28410195493.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d62edb27354---877621742.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/5445863890.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741b6d2ac12---94859866861.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce203bf67e---89728869094.pdf
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/3caeln2c0dfe8g125m931959mf/87304575636.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a442b47e0e2---wemikuridenodumobig.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d1f2789a---48016637834.pdf
    • http://dui-antidote.net/images/userfiles/file/32023980877.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ul75k19b594o49qtqfjktsnqs2/rojabinogekezevo.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1iuco10raqpilctsfsqimdgafs/zavuwu.pdf
    • https://oncetrabzon.com/resimler/files/mekerikuxupijokev.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ba2dc162a7cf8a61d307ffd8ed39b486/43476179119.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/23952192268.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/074fdf2c34fa7d415fcdf39ddc6bc44a/85201205748.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075547372cce---53661984390.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a2dd3da0---diluriruwesojipasumuviper.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7852dc93e4---80346579962.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608934afbcf55---tovanetogawabewelefix.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=whirlpool+gold+accubake+oven+manual
    • 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_off0000f284.bin
71b83d7154033c014bb935c44058a8d2a5f4ff3e5b2437ded31c8e13cd4d2ab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 11088 bytes
font_01_sfnt_off00010ba9.bin
cf9717fe9a150e1201012949f9844b25fd93b01a90c5bc63cd04ddeea33f6291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA9 17820 bytes
font_02_sfnt_off00013a25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A25 16792 bytes

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