Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fc00269256c50a…

MALICIOUS

PDF

82.3 KB Created: 2021-05-03 01:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cbabcec3d9f8f55959daeeb115c3a8a3 SHA-1: 8ca9ee30dcb3ca9fb0fe0db2fc2a228cdd58ceb4 SHA-256: 11fc00269256c50a41d067cb6e1553feccd39d4080f2148d588b6039828a2399
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV both flagged this file as malicious, specifically identifying it as a phishing or trojan PDF. The document body is heavily obfuscated and appears to be a lure for 'adjectives worksheet for grade 3 cbse', likely to disguise the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allycatering.com/userfiles/19804404797.pdf In PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/r268i96pdn07ubl41e5i3r40i0/29569175620.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d34e2ca77c---tugazapitegiginupumu.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/484dd865bf505b5f90e3d99f2315a8c8/4317061574.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf53cd1b28---44439857605.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/bd50f084cabc818b76348dce5159e340/92197560093.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/62ac583c44a089f48209fb98f05d15f1/74613921580.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8e6e9638c---87005042070.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92ad7dee7---85406643501.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/47vu2h3lo0i0p4nbglt8qu6pi2/sufav.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jkbl975vjpq85f1l4btve42ndf/luwejodatizavewelik.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/dowiwozinibeb.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160707f46cb650---mutokuro.pdfIn PDF document text
    • http://adveotec.com/img/file/rufokusasexoda.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/rfc9v548019rfr93cm29ecvc2o/vekizuselojekorifenetabir.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/g3btgdh0tlctuugmfplqu5dc51/67846146567.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccd8b599a---surulupupa.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/2fc44722fe60678bed5aacd4af810dd6/76363263137.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=adjectives+worksheet+for+grade+3+cbsePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 3288 bytes
SHA-256: 160810561b28cd334c267c5da2944ef6909cbaabc762d1e273b7f1cf164d9c81
font_01_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 5836 bytes
SHA-256: 687c9c861f079fdc4dffba93cce26c7c9dd415961229f63789689de56224bf07
font_02_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 11332 bytes
SHA-256: 510a96d5c237d6ce91a08757a20f439e96ca691fc1a91592f7dd7c8952d200d8
font_03_sfnt_off00012fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA7 3200 bytes
SHA-256: 1b173c21b13f05ebeb04e428e3ed8fd3c5765e1caae24ab0c90baa29278bc3ae

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