Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c807ca630fcdf6…

MALICIOUS

PDF

67.7 KB Created: 2021-09-25 03:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de4e3bc0fd38f19b572ff7259ecb7ef3 SHA-1: f0b4f428c28e7946d13f82ce29873e83fab4dd3d SHA-256: c9c807ca630fcdf619ae46135e3d070ab9ad4055272b7f96a4b0035b8865f320
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to obscure the ultimate destination. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document with an action trigger, typical for phishing attempts where a visual element hides a clickable link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://retailcop.ca/files/3609923161.pdf In PDF document text
    • https://akapacha.com/userfiles/file/87762897190.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/kipowalifetubelawos.pdfIn PDF document text
    • https://12waktu.com/contents/files/33559993411.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/dawolasikidu.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/kakibuwezoda.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7532a5c8b5e5197469f9da7c75a77cba/guwevano.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/874803441.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/gabekebalafuwuxim.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/pusosowufagevorafeji.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/52017257429.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ld372jm95orbdl0krpl4hhvrm1/39170135253.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/92c9521f3c7f3fa354d8c3093536b5d8/63396849313.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161474cf9de29b---jegejovoxixi.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/pufinibakizolaxofujapoku.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/60623277172.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/wagenetanaletutevopinuj.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/72734125779.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/dabigotub.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/xenezusodozujedubu.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/nesusifix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=rome+2+trainerPDF 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_off0000af33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF33 14152 bytes
SHA-256: 6149f3ac3c12096ad99e9190cd4e9fc4f25c9a85afdd44dfd79d757af4b7ffac
font_01_sfnt_off0000d27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27A 10220 bytes
SHA-256: f6dfd61c09ea550b6bbae537f23ae955308aa6b1d0a0482ff8002ecd13d13353
font_02_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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