Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7ab361d353a3e7…

MALICIOUS

PDF

76.2 KB Created: 2021-06-27 13:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7840d971799b6896ae69709548b7f656 SHA-1: f16aea6ccc450ed1c0add07f6b1b1940010b2ef6 SHA-256: 9d7ab361d353a3e79983669ea5898d11360dc1443cf0fee5c1c1f33f0c64ad8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to obscure the ultimate destination and potentially deliver further malicious content. No scripts were extracted, but the presence of multiple suspicious URLs and the nature of the heuristics indicate a phishing or redirection attack.

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 https://stef-nancy.fr/upload/document/8592221804.pdf In PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5b3ad8e7eb50a83e1da4ceb47dc8eaac/58304558610.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/bejanajav.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/99798501923.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/pelenajifiji.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/80aaaf2f18f51718f0b3cbe794461fbc/dufepixuwutinekelajatebi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9577d451b---21208806400.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/f699208d06b48ff50283e476d81ec373/tobiwamegetomidiki.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/refakozimesok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc37cd5538---37162528721.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc05f9a067---54388816703.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607199d6a2a05---zesunapizawexe.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/3pg76ifpn0k67gl7e7n1hcj08d/27532106380.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/utj6onqs0cdiskaq3thvud51s1/72296615006.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/08c7fe724a89a224a251e3ef86e298d9/nofejuxupugawawanorigikum.pdfIn PDF document text
    • http://stasta.com/userfiles/file/98540176766.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a6bad70ab886bdd2925d63281d12ad7b/towawozaviregitemepebako.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a5a75fc36be1551265fb3819150f8dba/xatuj.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/7782512294.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/bfe3e49b8fce2b9064e9f282263c9202/63918466053.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/30354700740.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0i8ol8s20m91l7l0844b2gcb6f/ridozexino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=milliliters+to+molesPDF 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_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 17208 bytes
SHA-256: 8a5b8ee1fe83bd4a62433b062a56c0b7cf9b33fb5748169868eaee8e21ab51a8
font_01_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 9996 bytes
SHA-256: 3aeeed9e27848e185994d0e6282b471402333c6e6f8a6ef0b0a4a3d9cd85f7a2

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