Malicious PDF — malware analysis report

Static analysis result for SHA-256 613f08bf2db99cd1…

MALICIOUS

PDF

126.2 KB Created: 2021-07-25 03:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f4a3d77ae7a1aaac5a073937c99854bf SHA-1: 5810b8e3993a1d623d8884703f8a51ec222015e7 SHA-256: 613f08bf2db99cd1d6058d5993ff281f351e40e849be2919c5fe9fad6d64837b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of multiple links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/0094f9e69eaeb83b5c7e9b1b005546d6/vixokinajipalonomatime.pdf In PDF document text
    • http://dungcucaytrong.com/images/files/galuzifinir.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/narudininuti.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bacb0e7f971---zalipinimexelik.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/14242695014.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/biregubafedewuzo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609a711ecdc72---25813782948.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/47129214949.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/11705082664.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/venukojaweg.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b188409a2f3---gabutos.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c98b287052c---67772562259.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739f1b4a9ef---rutofuzidebizejomor.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb196c30b6---mavem.pdfIn PDF document text
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/niwagunasugid.pdfIn PDF document text
    • http://aweibel.com/Photo/file/45713806084.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d619b890721---40821933376.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070067c44bad---jorap.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/nixepaponafafure.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/jjn8n1eou0i0u7jgjosqjqoahd/62758052306.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/54703885137.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/nhd28jrqpp9l8og6l0r3bi3pr0/nekutafisaniwitigubufarow.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787e28c65fa---rulewur.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/todizikesisarawojinom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+5+online+shark+card+codes+free+xbox+onePDF 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_off000189d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189D4 11080 bytes
SHA-256: 12693ef77ea806ca55c1e624a906ac5ce6cb91d889add051fce86cc92269f966
font_01_sfnt_off0001a3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBC6 17476 bytes
SHA-256: 7f9e65158557474dd493514c6d8bcbe6b92ca4e73d2fc20b77df03a552a45417