Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffb8345bc0492d6…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 14:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d2ace9f9c41031c083e57b90a15a70f SHA-1: e2a3fd73463b61ee112aa8e3597189de2dd8ed6a SHA-256: 5ffb8345bc0492d677c94c06814dd6bff73c9c8fdd271b5f43df063c65b9c3ee
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malware or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=mini+militia+unlimited+points+apk+download
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133475fa66a8---22976954348.pdf
    • http://phongthuyphatloc.com/luutru/files/68242620818.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/85609711945.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec9863f55---burumukofi.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/52449388534.pdf
    • http://consorzio-csa.it/userfiles/files/pufumegetazidela.pdf
    • http://cabini.it/userfiles/files/8783728913.pdf
    • http://www.fonfe.com/uploads/files/jesupemerogajigimamizef.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc3794ead---94303852569.pdf
    • http://dsagco.com/Upload/file/jinalowogep.pdf
    • https://aimtronu.org/userfiles/file/99236973442.pdf
    • http://www.terresdescaraibes.fr/file/zumitewabavaxurotibulev.pdf
    • http://satyavnetworks.com/fck_upload_images/file/xefoxuz.pdf
    • http://usaoxin.com/userfiles/2021-9/file/79101456876.pdf
    • https://jasmijnbloemengroen.nl/userfiles/file/jirikidufemejiboxopim.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613447ae01419---zagolobifutosujalet.pdf
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/wuxex.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135927e09c88---wabajesu.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161332109ccd06---29989788081.pdf
    • https://medius.sk/userfiles/file/92268243078.pdf
    • http://temple.mo/userfiles/file/vodoxorizekalipamejurawig.pdf
    • http://zechnerbau.at/images/content/files/suberelususab.pdf
    • https://makenie.com/upload/files/88980197140.pdf
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/lutoledojedizeru.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb3c.bin
654d467b7faa699ac6d0f1391382652890230d4352362d6d1b0a19f8ae4f628a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 17860 bytes
font_01_sfnt_off0000f93f.bin
258694988fc57d4fbbcf2cd4ca1fa59eddbe276a34492443bee8eb81c8f2595b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 10724 bytes
font_02_sfnt_off000111eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 16792 bytes