Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ca410c39366ba4…

MALICIOUS

PDF

77.1 KB Created: 2021-06-30 01:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 35287586e651b28cebec79b72c7b2492 SHA-1: 6db7e28b1777a019161923e4db79a1c8dc90063a SHA-256: c5ca410c39366ba4ed9611b6d58c7bebb1143e2ce4e8af56fae94876d3b9575a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to distribute malicious content or phish credentials through these external links.

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 https://akapacha.com/userfiles/file/nojajudova.pdf In PDF document text
    • https://soechi.net/userfiles/file/412785354.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ujrkv2lfvteggnqcn0g974m0rg/99105598006.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb88145cb9---wotenefak.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f6cd0660efad0f7deca4340ba6548a27/79286884428.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/18703869188.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848d26acdec---50502425055.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/jukekesowepif.pdfIn PDF document text
    • http://kids-ex.com/vaputubufel.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/34323594589.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507101047189207.pdfIn PDF document text
    • http://canoeing.by/pics/files/bifabelodijefit.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec05a42f2---juwivatedipubifezeva.pdfIn PDF document text
    • http://ahchala.com/img/file/varoniso.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/zulusofu.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3af68d65d072794c842ca1f1d73ab685/54960320624.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf83e5aaef8---78118295676.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aced316dea4---fubef.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/26896897634.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/58836927366.pdfIn PDF document text
    • http://aweibel.com/Photo/file/98469492535.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c72136bc04---79335572971.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qb6picsib6r1lbc6r3jtlulifa/57421034716.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d46a5fb864b---vuzeselunij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=24+hour+fitness+northgatePDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 10648 bytes
SHA-256: 2369c1772495fabac9b9c47316023b939ed4110b895150ec91cf848ba3d9fd3e
font_01_sfnt_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 17000 bytes
SHA-256: 9532d71481287dff241509c97f8e1d4a0fdca784d1b4d4de0ba8307074615961
font_02_sfnt_off00010eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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