Malicious PDF — malware analysis report

Static analysis result for SHA-256 c281106828c8178c…

MALICIOUS

PDF

86.0 KB Created: 2021-09-03 18:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 969a731ef732121e56536a45e399e351 SHA-1: c5087987131a8ef040c6222028f76258ce99b37c SHA-256: c281106828c8178c67f00567e82113c66f5cc0e66788df7dbc90b0add0f3b935
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics indicates a deliberate effort to distribute links, likely as part of a phishing campaign or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=2012+toyota+rav4+factory+service+manual PDF link annotation
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/be9503ed508c6764ddcae1db532e5b59/2510827847.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/lezerotugikatajuz.pdfIn PDF document text
    • http://topas.lt/userfiles/file/godorikimubadi.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/rapiz.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/kamanajoxixos.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/79404663973.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612060f29e4bd---wowonutav.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/kejorosugufexojizojonib.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/rasuxajizuwavototowev.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16111936097a60---bidokanajupana.pdfIn PDF document text
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/nekowaku.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/kavux.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/5620905858.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/gipujefedanireliwuxi.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/12ehno5u97kgd4g95bc540og7p/kitaxaxajego.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/torug.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/warotedezopirigol.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/smbgrj1ptnd9ptprdq4714apj4/60711381813.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/47187952215.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160808fb7091ae---sejasakegekolipudenesorag.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/toneno.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/44159522868.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/9262146317.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b479e678---79373361917.pdfIn PDF document text
    • 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_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 11052 bytes
SHA-256: c22115bc26ca7d5fcfe6579230ce25dfa0782fc6cebe9c9cb8fcb4163bfe0759
font_02_sfnt_off00011b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 18024 bytes
SHA-256: 377300807440ad175f08b7698200e46ad74a20de89da4db20a7d0f8719b7031c