Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2d662ba7b23ff7…

MALICIOUS

PDF

102.4 KB Created: 2021-08-20 23:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 71583aa73874efd40f6114c64adaaed7 SHA-1: 175903af60e12852f4676cb76310d72a49176f3d SHA-256: 1a2d662ba7b23ff766fdfc9ce7f65b9ec0ce697cc57ec52b8feeea194f9e677a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely serves a malicious purpose. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. While no scripts were extracted, the presence of many external URIs suggests an attempt to redirect users to malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bayanairag.com/uploads/userfiles/files/12206043927.pdf In PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/5o8mq31d9rct517r06fa2s37cv/20687092969.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/41211988528.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/jizixeguzimexa.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/5625070953.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/b43vpcuc6uktfhq772ldesfvvg/19529163931.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/27768094681.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32ce76fab8---47504814632.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d750e7ed38---55607468697.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/264c45c25f361543951de7d8b7748752/nafelokoxojigede.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/li0ikku4rlvto3p2ftlfg775md/45621320955.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07c87ef9a7---2634545323.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1f13f33eeb566f9a954ede6f7849caed/murikufezixotirujitagav.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4676a77143---sabuvudu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d87b635d3---66613037286.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d11bab475---42567868823.pdfIn PDF document text
    • http://blueyee.com/upload/file/270431176196.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8e486a1f---wikolenowav.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa0aecf2d8---99517885664.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607935ad30d6c---muvazimowuzonisule.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/mqv3jhf2amqvr5gc5od6a3dlt9/33051164487.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4777bdd9---91385668969.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/939597293ec535b556d98f97f8174c48/66043720809.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161076bcd2b91f---zuzaxikajemuxosegosebel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+adventures+of+tom+sawyer+pdf+bookPDF 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_off000124cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CB 20624 bytes
SHA-256: cea8b35b4073b2fe23d7e8e0cd32d676a1f73ffd313dcda0ad8f9d9c60a7b1b4
font_01_sfnt_off000158f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F1 11184 bytes
SHA-256: e8f8f68873d707370c6a461bf577778f188be8f80b408057031b2e9b1bc1f2cf
font_02_sfnt_off000172d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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