Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c67a960d0658fc…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 00:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 749a0502772434dd47798cb857e44b19 SHA-1: bff760ba924996a088168e76aba0285f271af18d SHA-256: 05c67a960d0658fc7f1bafac5d7608c56467f8e57b33ff1d7f527f0a42bdfc0f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://srmhospitalities.com/images/bulk_images/files/3572249674.pdf In PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4cadd3525f04be80c90a5faed8cd063a/zureturifenopowugalesika.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/eo6m8h8p948oo5gec26029log3/fulefixap.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/lisizuruwo.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/xazaranizadiwuwekiwa.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d471a2f838---54749916957.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/tupidanaragiga.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc1ab1c4b---11270216759.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa728f6e9---89828818745.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/lularepigixofi.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/77439308533.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e149fa41bf8d17a1d0b43ea4110cf270/vejijibariz.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a306892eb7---46757299085.pdfIn PDF document text
    • https://ayurmitra.com/files/file/98368364192.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/80615641328.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/zijilebotipimidubezulaxab.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/jomevibiwopewulolegopa.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/68287389925.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4fbb732dd---wibik.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/14197320200.pdfIn PDF document text
    • https://virker-ikke.dk/files/66373840982.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fa7e80fd8144b18c5652efe34a253b9/lorowaleveneninebiwiner.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1b3d22b02---80079032073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=manual+testing+job+openings+in+noidaPDF 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_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 10828 bytes
SHA-256: a0f9c157db35986a02f8f69d9fa404da36710286b15bce7f5c64ae6b25bd917f
font_01_sfnt_off0000fa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001125a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125A 18060 bytes
SHA-256: b8103a06eefae6d5687a5b63f6461793d91b7a7ac293b066fa860ccc8bd545b9

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