Malicious PDF — malware analysis report

Static analysis result for SHA-256 85800b0c165f1567…

MALICIOUS

PDF

92.8 KB Created: 2021-06-28 00:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dc7cb2a176d6582b999821322f8b6608 SHA-1: 7d226c8d635cf21da38dd2f7a9fc86104c538c37 SHA-256: 85800b0c165f156704075cc1548fd5c1ef03a4dba1ec9d132a6ed9041800128d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs that point to compromised CMS upload directories, functioning as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators suggests the primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://allytemp.ru/uplcv?utm_term=thanks+for+your+input+meaning PDF link annotation
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0cac77ac6---36422210309.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/0f274d9b1bb1c95a420788d0a88a3aa6/zipatusakotuxafogago.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/55914356097.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca52b6400---vojobudimugidururupuzi.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210625014602_eg7klm.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4bcb2c18---71355509519.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/10645798612.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9effe7ea4d---tazediri.pdfIn PDF document text
    • http://plncse.hu/php_data/file/xefikuxoridojibuno.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/84827738543.pdfIn PDF document text
    • http://emeat.ru/var/files/38616779667.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a16eb79aac6---pizavuxuwabavijutezoga.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/kn80feeh80gfh7rul8lvkkhbim/94684080209.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16071635995ac2---purarebitowigumeru.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/felexepevuraxe.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qt6e1gllfgt4v4dvhmv96r6mr6/zepumenajato.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/lufejijavasakuwobo.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/67753234737.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ab17a926980437c5833113df1397986f/52594009187.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/0d2bcf6f014533da5bcf7528df10255a/57748846841.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c53a10cd3117c3cb43ebe3dfba168d8c/foperez.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078fd89163eb---15086731199.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/kubetizobedutoriragema.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/9c02757820ca514fe953dfbc75a096e8/82540884754.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_01_sfnt_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 22372 bytes
SHA-256: da38f2fed47128b7b029d62738236e035a6fbe401caf1a585ec3b71ceedc1f98
font_03_sfnt_off00014c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8C 11028 bytes
SHA-256: c79fe7c155934544454420009f8ee245c825dfedcb3c1d6570c525b93c102be8

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