Malicious PDF — malware analysis report

Static analysis result for SHA-256 664c9359fb542582…

MALICIOUS

PDF

84.6 KB Created: 2021-08-04 00:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: db9fef362267868cf452f0207dd23de4 SHA-1: f3dba905ddeb807ff6cb831ffe96e0fd0646b006 SHA-256: 664c9359fb5425822204c22921f55e9d8b3baac5ac16dc1d6054b3cca10098f8
156 Risk Score

Malware Insights

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

The sample 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 potentially compromised websites or disposable hosting. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://elementsgogreen.com/userfiles/file/83599079839.pdf In PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/59738249078.pdfIn PDF document text
    • http://jngf.cn/files/file/taxobavazuwoxabinapuxiji.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/39322980047.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/puxomabenedigiwasu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b95b617b8---sodimawofitamulib.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/welaru.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606effd0821be---jikaf.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/95518053056.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/59128550622.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a7567dd0---repepo.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/lipetolodajojepuxusoz.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/pafesirubaponed.pdfIn PDF document text
    • http://tyextractor.com/d/files/banisuvega.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161001c2d1f3ea---54673215388.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/23396792959.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/03deb744f13796ffe53c41587a9209f4/65845736530.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607261f2b34ad---25359276711.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dc337819c50---zupogatunabudizixojasata.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/93933909945.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097ac612c333---73306522768.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/gogajejimuxeleledizesum.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/e4tbf76l3cv6cqclqn587gnc55/xigiremufedekiwolisarev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=can+you+trade+on+fidelity+on+weekendsPDF 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_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 10772 bytes
SHA-256: 330e7292e9e61d8945d6e5465137d98e7dc84d0c1325104be6b2cc9bf77c88c8
font_01_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 16852 bytes
SHA-256: 0afe47bc05f11914d7cbe86f192c3cf2a4258bb8406e164495ba0b1f6f1236fc