Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04c30027d0fd5c7…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 02:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 53dd40facad735981c4f9da5bc74b039 SHA-1: aa555a1eb6b6376a2b201e95d4efe3991312b7bc SHA-256: a04c30027d0fd5c7687b7c877c79c4bb94ba5a40ae3771a92ae92e7f586463ac
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of these links suggests an attempt to lure users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feb50a875dd---99342467106.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a24add55---59391588613.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/53849086352.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099b6c49cda5---533114143.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/lobutirigixoxunokudodamut.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/96612641440.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607228cb23871---21805287246.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/ramatojudomu.pdfIn PDF document text
    • http://18554080.com/userfiles/file/16714363273.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/13828794582.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/vimirotugowat.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210718_0B943C3B6A6AF360.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/90970413632.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/tegevinid.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/talemobofepamajopug.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/78911676336.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/86960072689.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb157a0aff0---95197997778.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec952b52aef---30657013452.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/g9aqeaja8044ed7ii79tldpk89/97777064312.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/71136921418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=abnormal+psychology+david+barlow+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB05 16920 bytes
SHA-256: 5c8e2bdf6b81d96289405849514bfeee092384e391553fcf09f51ce6a059e14e
font_01_sfnt_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 11224 bytes
SHA-256: 6a3c2234722a32f898d8d599b46118cba00f7cb45f45de1f59a21e194e446f2e

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