Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b331482da1ad036…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 02:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7524d94da2caca008bd9d9d2ceadead9 SHA-1: 97ac09605dfce09c6bd71d24c741c4e46872d842 SHA-256: 0b331482da1ad036f1a1a5f2dbd95054e4cbb604e7959e0f93f0adc7642ee642
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=how+to+transfer+files+from+phone+to+laptop+through+wifi
    • https://pactforfamilies.org/ckfinder/userfiles/files/baminonolok.pdf
    • http://aktien-analyse.de/images/File/3619562999.pdf
    • http://alfatreyd-mebel.ru/archive/images/file/paxojizewaxiwowafazupor.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d980bc50a3---90922543350.pdf
    • http://waypl.pl/upload/File/radevibarogesikajesefivoz.pdf
    • https://unitjaya.com/contents/files/57231338886.pdf
    • http://dezis.ru/uploads/files/lepane.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1ed0b2ba44fea4d762b4ce53266196eb/womefebo.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16143a372454df---didog.pdf
    • http://euredit-editions.com/userfiles/file/sawibekuxirazasusu.pdf
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/tazanomejofonoli.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6ed3ba22fbd376d5666392cc3304c3b5/zibekewawivora.pdf
    • https://spandoekland.nl/userfiles/file/17227927937.pdf
    • http://lafenicealcamo.it/userfiles/files/guzebetetiwozuwiro.pdf
    • https://cowichanmusicfestival.com/userfiles/file/fizusabebezapatililitob.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/19068662608.pdf
    • https://equinox-e.com/upload/UserFiles/file/30343715155.pdf
    • http://primeasset.hu/fileok/file/42856680026.pdf
    • https://clubsecurite.fr/webroot/upload/files/61836593249.pdf
    • http://honyi.tw/ckfinder/userfiles/file/92566900436.pdf
    • http://77owship.netsociality.com/upload/files/89731497426.pdf
    • http://phuocthuan.vn/images/pic/file/sovadigep.pdf
    • https://unique-u.biz/images/uploads/file/numifilakaturuvutop.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/nobutajijixavaguwipe.pdf
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/51632622518.pdf
    • http://razaviota.ir/basefile/razaviotair/files/jibolabazo.pdf
    • http://aliceinformaticasrl.com/user/pages/59921446973.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6d7.bin
165535d30175d569b9a28558f8f3792591fb2344622f058aee15194efd809a4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 19656 bytes
font_01_sfnt_off00010933.bin
505c64e480792ac96fefed7022e3431abc7426f0d2a54e4a305fd9e6a35e5b83
pdf-font-stream PDF embedded font (sfnt) at offset 0x10933 10980 bytes
font_02_sfnt_off00012284.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 16792 bytes