Malicious PDF — malware analysis report

Static analysis result for SHA-256 9619e286b9caf1e2…

MALICIOUS

PDF

125.7 KB Created: 2021-08-18 00:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4d172c785c23986d4de7bd37c59654b SHA-1: 854df5c56002bdc43b54b6e99f5c1e251e73b110 SHA-256: 9619e286b9caf1e2cc533b71d4c99a14130c9e4fcacf5ffeab7696d2de105fbb
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by both ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The PDF's structure and the presence of many unknown URLs suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608c283627c7d---83890618767.pdf In PDF document text
    • https://carrieres-pierre.com/userfiles/file/xevipolizapuxiwerixipi.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210808114403.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/zedusudoxifuxibub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c3964186e---56232368384.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///mibotugofazawamodesejubod.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/vkvih7pn0i1tob8478rlqoelir/biziju.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/43327278319.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/36216706270.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/23000332725.pdfIn PDF document text
    • http://ridendo.cz/files/file/77711223847.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/tevolafezi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d283ac9ac32---9003156920.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/7682871597.pdfIn PDF document text
    • http://findplusltd.com/file/84541429153.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/oub5b7l7o6cmi6otapug0amp33/guxupolexokemanawoti.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16103f4e271248---bozenixalarelabovodetil.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/bopotale.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/nezokuzefulujimej.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/kabozezebojegurovajun.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/xuranezilivarizarati.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/75110404542.pdfIn PDF document text
    • https://red-adlay.com/upload/files/90814014331.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/jawovonovumalevati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=introduction+to+linear+optimizationPDF 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_off00017c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C38 10616 bytes
SHA-256: e55f595395184e992978b1302746305dc6c670bccdd35ce5163e95a49ccacf64
font_01_sfnt_off00019471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19471 23184 bytes
SHA-256: c03d8c07b723ba13cf803e6b29bbd6395b571a400ae9ad65b4aecc0f3b6e61b8
font_02_sfnt_off0001cff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1