Malicious PDF — malware analysis report

Static analysis result for SHA-256 10086b15a6db9563…

MALICIOUS

PDF

75.1 KB Created: 2021-06-16 08:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: af472a5ec6c164b8b143ab8826009a1a SHA-1: 64bcdcf90b5abbbd73e9177197c719b1cf1e38a4 SHA-256: 10086b15a6db9563a68a0fc1afdfdea115ea04879c5119436a2ef9a0ded145bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to URLs that are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://chcial.ru/uplcv?utm_term=subject+verb+object+exercises+with+answers PDF link annotation
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/vce2btp0cfjel0g3h9p22tn92o/zifaxagaguwapebelewezub.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/dipedubinulazafogigijiw.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e8d63034---wejixulejuliwagu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987e520024b---vetigemefugapagemog.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7d869a962---nutixakaxusudivuvimel.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/65290292907.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ec4ae181cc08e306610d10efa5a85558/19374434712.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/de39484edb22a46b7279be0a6d7ccc26/paxapero.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/523cef0767ab06650b923c18d9355ad2/gufulezixubozajiref.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/rumuteg.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/68738586037.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/58394508863.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/lg7p0hs9dqokgmq47pdek0gpa5/zakafawipabodedaviwaj.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/dusorufebexon.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/089a0f18c3401b1cbd649a2aa8d87a39/68094073418.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5c7dddeea5bda30fe0b54047c5178791/giwuganivogutevaze.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2c1046865d755914620899a36c42ceb8/13755254810.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 5396 bytes
SHA-256: 7c6117fe88a38e9e2f1b7f1e0353158f0c8ad6abbb4ee87a5d3ca4476e86c438
font_01_sfnt_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 10900 bytes
SHA-256: 1838cb01dbd362d2153a63fd5c7677174a58d426684e42f2914680ba1a7db4eb