Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbce0c038ee6195…

MALICIOUS

PDF

85.9 KB Created: 2021-09-14 03:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ae917c6d8db9f843050593d62e8e69a SHA-1: d3527f0da9d942ae274eceda13d933c9ced068c5 SHA-256: 8dbce0c038ee6195b196e0a7c7b5a906059a0f3c6932526aca23e7ecf8949952
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of a link farm is evident from the heuristics and extracted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=how+to+download+audio+track+in+mx+player PDF link annotation
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132f19534ae5---44644535142.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/55659455106.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/wominobunokazexifalefome.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/53057298381.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f453c674f---14403689358.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/011651168185.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323d15cec31---zipuvajekaneg.pdfIn PDF document text
    • http://signauction.net/userfiles/file/78879563914.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/4399506482.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50b7eab18---logaxajabepigirixirer.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/68113104480.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/mujike.pdfIn PDF document text
    • http://xsteelstock.com/d/files/timawapufidiwigow.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/84706321644.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8f5748539---33613789319.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/xotupoxexevakuj.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161302a86e1b5b---miziniwulif.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc42e69ec---26632190964.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/xexawidokamasexiboga.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/fanokoselogun.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/47800881584.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/buzedeliz.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161334ace448a2---51597995415.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 18184 bytes
SHA-256: 898d976315c333b0c576678032d2c039210c497dc6bcff39d8d0322a87f11b66
font_01_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001300e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300E 10992 bytes
SHA-256: 83f3490499421af1fb0cb32241083c8e7664f3e3bcacdda9fe5d7d81ea91e419

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