Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd971cce3c088035…

MALICIOUS

PDF

74.9 KB Created: 2021-09-15 14:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 404c8f136293fc2b6ed4da29fbe6a4ca SHA-1: 3b07755399b54b59158cfd93d90b7ba2d2c4efd0 SHA-256: fd971cce3c088035827bf647c15cdf1f5b80ede161c11d369437c73d3a7f949b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including one pointing to a WordPress upload directory, suggests the primary goal is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=imovie+video+editor+free+download+for+pc PDF link annotation
    • http://kaus21.com/userData/board/file/surifezovejazu.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/79103848198.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/fekolo.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/66836391847.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/36283251474.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/ligezetujudasulidasiwi.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/vivonixofudawu.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/ridegasunas.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/97b123d194bfc34cb633588021239008/80062015364.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614114d792407---11901013680.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/50912174712.pdfIn PDF document text
    • http://hmed.vn/upload/files/15145531265.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///12212282045.pdfIn PDF document text
    • http://ctm.it/userfiles/file/movukufivibigukivam.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/94833585902.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/60829784796.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/64601825414.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/porevidodub.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/jomurumufofelosisadezut.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/buvirexuzivukobaseropesas.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210914_072050.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///46571029395.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/b1bj2igcrq8vqpgdmt8qcj9g6q/gulanafunudurigonobu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF80 17232 bytes
SHA-256: 46fa912b2d6f741868cfbafbe53285c45673d9d7eb90f0d2f2953f21d75b1b88
font_01_sfnt_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 10716 bytes
SHA-256: 94ce5d774063686121093711c6ee34e4e603bcf3281971c51260b885e5a78a48