Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd462e8546ffc890…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 14:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e95f974f9965422eef613a47d1306d48 SHA-1: 3ad165338aadde425347f2b1c767a1f991dd3e95 SHA-256: bd462e8546ffc89013a3a0af63890296a3a7bbf6560507e3c6d3ac37d226221b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external PDFs hosted on compromised WordPress sites and other domains. These links likely serve to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/86cd9696444e1d82048a084c67acf37d/vawinolusiverigedijov.pdf In PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/vevalelu.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/kesimodetivutajovebilav.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/nodobe.pdfIn PDF document text
    • http://willbramephotography.com/fitazuvusu.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/uf19rqt81hmr58cv17a39gf506/gatuxuvadolilebak.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/mukitopujito.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b748bd8cad---9595567963.pdfIn PDF document text
    • http://slsnn.ru/content/file/vutafuwubawuluwapimu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316216aa6d3---suxipixet.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/789121b52cec03c320b2419113ff67d2/fedumabukepapiratizafu.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/nizoxatiwutit.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/liserikuweter.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/48198131311.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/5cf4a5837092653f28943b6a2fc06f1f/83597336796.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac696eeb545---sodowerol.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc316e5c36---20885902671.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/gozexexetijiduwigubuj.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/90437575973.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1610d83606112f---bilewusanemudezog.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/vexajofobofesiwazilajeli.pdfIn PDF document text
    • http://rurisnet.org/images/file/fipugimuwe.pdfIn PDF document text
    • http://etre-belle.su/images/file/70650539144.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/mitujepolig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=vajiram+and+ravi+test+series+2019+pdfPDF 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_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 11120 bytes
SHA-256: 02691ecfef53347898c00eec6ac25e27e3f856d3c90594ed4c1bc248de7bd382
font_02_sfnt_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 20656 bytes
SHA-256: e1aa10a9e1e51eb5d430516710ddef91aa169797f62c4719ba57e89f50065e04