Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61949817c6f8a38…

MALICIOUS

PDF

78.6 KB Created: 2021-08-29 19:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ecbc110940383e609164984095335c65 SHA-1: 036718fad49935b16cb8ef89257cbf9e3eaf34a7 SHA-256: a61949817c6f8a384f7bcc059126cf897ff658a8c9bd84050ef0d93946130d9a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. The heuristics suggest it functions as a link farm and a callback phishing lure, directing users to various compromised or disposable hosting sites. While no scripts were extracted, the document's structure and URL patterns are consistent with phishing campaigns that aim to trick users into calling fraudulent support numbers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://drafthe.ru/uplcv?utm_term=safety+first+air+65+manual PDF link annotation
    • http://boxshop.mn/userfiles/files/mubonetavorajeza.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bcdbc1275---voxopumavebapidibivaxof.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adcdb395640---todugo.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/29638949379.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/73254086717.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/ganuladewit.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/e4lvf0vlrqvs89capqkbopa517/53915535087.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160731ab8e4af4---85162078707.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/gotoge.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/98968243912.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/601g7j8k60747ks4bqh8qfot0a/putagik.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b37ff94ab4f4f662b56776731ceb0029/kixovajuweg.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/1449089707.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/83setsgcgi5jslje0apafg01c5/fobuzovewifenotuzog.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/dobijujil.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/2p9nu1s8k7jnl32pv1j62i7mc7/tadibajedopigiwatimenuj.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///lenugadeboguvijajapidadax.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/vopavilojamivev.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/75276015014.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b76149306437e92eed56b0ec0000b098/siwejitisubusefanif.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/63579807050.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/44970273466.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/fr3s7eihgo5s6nhtmpjpbi0pj6/filesubikedazuwar.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5f8f2620d---87651913057.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad75b9062---zojajojewonogobudekitel.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ec29feaijnfsggo3nq07l18t5d/lovun.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_off0000cd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD25 10844 bytes
SHA-256: 5c3ec99b2d356e6af2397c3ceb1301e3433057dadb66fb7a713d84f8a2a1a283
font_01_sfnt_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 17016 bytes
SHA-256: 170044f715e27bf7866605ae4b34457323e43a190ecf4fb652c178b3a198c6d7

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