Malicious PDF — malware analysis report

Static analysis result for SHA-256 3385f9d014a0aef3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 12:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7d9c78d504ef6ddb58033435c884b87e SHA-1: dc5ff7c719c87d5bfd8fa788138af1b55a548139 SHA-256: 3385f9d014a0aef3914eb23558c617aec3d44b9364c98d137ba3b566c0108a97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple unknown URLs hosted on compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to lead users to phishing or malware distribution sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160e39973c72f0---98888001545.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a964d6f07---nejolevo.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/leleninubasuruzogog.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/26057400702.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/xotogubenij.pdfIn PDF document text
    • https://digireg.nz/upload/65109176326.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584abe8ed5---83262310846.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/051658214299.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/14502842159.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/18833542520.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/59348019161.pdfIn PDF document text
    • http://terminsk.by/pics/files/51591688734.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/41212284612.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/gizadesowolifo.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2712a2f0c---buwetadivulinuwe.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a2b9c2541---87920748380.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/qij31c1h71tavibcp9jne3ec9e/1693656034.pdfIn PDF document text
    • https://inifd.london/uploads/file/24456073529.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/48333655992.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/bemalinixoradim.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/razewo.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/jitit.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a50a85f819cc9038db21fae54805dc46/vewit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+put+pdf+files+into+one+document+macPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 17488 bytes
SHA-256: 219509a3a22bb29b4df28e2778810c63ea42bdaf42cad692dbfe49d9334d7a6c
font_01_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 10860 bytes
SHA-256: b5505f63338bea93cda99b7df954cdc1e414a1158e3f84a47eccd943637d9814
font_02_sfnt_off00010af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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