Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d604dd526fc718e…

MALICIOUS

PDF

82.5 KB Created: 2021-07-13 13:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b5e01b06490a7768bec67fc61d6d982 SHA-1: 954f3404105ab3004a9f90cccd9238857971af3f SHA-256: 3d604dd526fc718efb64f624f3d1c7215ab4df021f3e8495e7984e4b12f2d3b7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF is designed to lure users into clicking links that lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70e284743---2465022206.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d277ab415a1---joribazabunirawes.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16256733594806.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/708269091124267840e43fead248a120/40558408602.pdf
    • http://provia-events.de/pics/fotos/1/file/69445494649.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b401c2ba139---vurovebofavuxufunake.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/826bd7ca2307cfdad9d76c08f69f1342/65045641263.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2c5ec2a8984053338538715276ac5088/nokedipavu.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3be9611eb1---84495426212.pdf
    • https://aawyx.com/sites/default/imageuser/file/pelepabasivo.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6a5df2106---loruvagusumikugosozeruzup.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/c6645fbe8a07e8686a94ff25e31de71f/37188471675.pdf
    • http://laulumaja.fi/ckfinder/userfiles/files/tokogipozixejoga.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6329315081---lipiwiserofuk.pdf
    • http://www.companyforte.com/imagenes/editor/file/29603565750.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/4oua9cehg97vs8hqife9u431g3/pitajuzapumunadisa.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091d1ba1f8ef---57493106426.pdf
    • http://casaledellasignora.it/userfiles/files/fuxit.pdf
    • http://minhphucvietnam.com/uploads/userfiles/file/17547138447.pdf
    • https://skvely-kup.cz/files/file/59800373995.pdf
    • http://tilestone-pools.com/i/File/natedufurubanavefajopud.pdf
    • http://jngf.cn/files/file/molekevatajalovofixamel.pdf
    • http://moscow-vernisage.com/files/files/laxuwavozoveme.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/fc020ba25fa0aad01bb2b27a48720f81/lomipubumilirova.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ea22929e0---13717655388.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/t96vc9f5qvod4su1635mr01a93/97397390126.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=white+fragility+ebook+free+download
    • 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_off0000df60.bin
a759402e930a4af372e9d1f7f4a9571393cb52ce9f9103a5ed272291dbd04590
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 10888 bytes
font_01_sfnt_off0000f853.bin
2efa218de72db6425dcd088da20dfacb1beddcb57d95ea203250e36ec3b913d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 17032 bytes
font_02_sfnt_off00012466.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12466 16792 bytes