Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f53e75a14859860…

MALICIOUS

PDF

84.9 KB Created: 2021-06-11 02:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a0343b38b73f6c29bbc76065e6a98c48 SHA-1: 0e09816bcab566b470e95eb79f9e085cbbeafc77 SHA-256: 1f53e75a1485986081c0612e8389180af671c3030eb22909816c0ea4e63893be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of these links, combined with the lure of a 'free download' for a religious text, strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=aditya+hrudayam+stotram+in+kannada+free+download PDF link annotation
    • http://paillasse.hu/userfiles/file/gufapozetaxaragexe.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af4993f104---18540485638.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/e185a3e991afed9979f3cd4f14d9b35e/39149948241.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/56979570108.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/tutepotoramereboku.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/05f20888ee922d73e6a263997ee1b6c7/76621969230.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/iktajkqp79g9q10a1g8ie523a1/42846858845.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/27250034617.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0dd1306d26c8e47e0d4525e8b2545c6a/51626958019.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/11516261312.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/zoruteke.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/jajigunukusetubudidosu.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/10971341661.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e412b540b---dovixiven.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16080a31623d38---lukadaxoburopa.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/lezumidatemediseru.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/zebupalezarapomexinalujog.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_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 5392 bytes
SHA-256: cbdb03ddd0f309223bc67f7dfd06153d52adad87b552d3cc759b31c52d0668b6
font_01_sfnt_off0001221b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221B 11132 bytes
SHA-256: fef9b442f90258c88108070546d93e787d616085b49bd2a35045b53207bf0a9d