Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa9c259e4f3d166…

MALICIOUS

PDF

85.6 KB Created: 2021-07-16 07:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3358016e6f7802adbe2fe2a6a65a93bf SHA-1: 5be2c9c16f4595fd2f54f4c80da8e8b4b63dbd65 SHA-256: 4aa9c259e4f3d166803e5430ce088b5f642c67329ff37beeb84c131351b7d222
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external sites, many of which appear to be compromised WordPress installations hosting PDF files, suggesting a link farm or redirection scheme. The heuristic 'SE_CALLBACK_LURE' indicates the document may be designed to trick users into calling a phone number under a pretext, which is a common tactic in phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=save+as+pdf+extension+for+firefox PDF link annotation
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/25cf84042e8beb41733f49bfd2bf8cca/82328471398.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/dajazusirozejipuvaw.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f555241fe---letev.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/2jkst7j2rh044tlin16fus8kas/66029863101.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4418142f2512cbe6231df7aa2fa955e8/vufubikivolaba.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e681e442---xofezopubarazafupomulun.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/60723006436.pdfIn PDF document text
    • http://navigator-33.ru/media/file/91133672088.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/puxuz.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/497227e10b873b2d040bd7cbb48d9d7b/64490068036.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f352a9c1b5c0762a634cb89ed8cdd0ca/xijujamavaruxefana.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/setuguk.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9h1pbn1v8rdirbl0c0imv6vk86/xadasumomof.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/52961576609.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/mudosaxadosufu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608656d46f10a---10480246270.pdfIn PDF document text
    • https://chp-travel.ir/data/file/61051983479.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/24571166402.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c11ef3b5679---jazaxe.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6d9r8g25s0653u9hm6tos2he15/28256904667.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/65110a822116ed2689ea4a43f7dc90e7/12398237231.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077e6726ec94---43107632715.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f5b00918---jugigu.pdfIn PDF document text
    • 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_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 16952 bytes
SHA-256: e59c02ef6614a02a77bb42bf376b4e3593484aade9f18efbc5f9bbd2bf08f5b1
font_01_sfnt_off000118c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DF 10688 bytes
SHA-256: 41589ba0ff64ad4a46b7deec052b9ea0650135f0e003fe0a640f1bbd5da7878c

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