Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a613ff03a872f3c…

MALICIOUS

PDF

90.3 KB Created: 2021-07-05 13:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e157d09f1b9852c61c444aa684938b2d SHA-1: daf819743c33aa0f8fb70f397f66c59fb5fce707 SHA-256: 0a613ff03a872f3ce53c7f6eab514dd0df091ce1633cfc19bc9a524aabe2dde9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://huntic.ru/uplcv?utm_term=state+the+type+of+sentence+we+have+made+progress
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775c83b5164---6113950005.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b537cacd7d---23187078593.pdf
    • https://batikatravels.com/userfiles/file/49457469211.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073504c5f3b6---98334934536.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b01e8bebd---rotopiretitixise.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6fb82a147a5e43d39ada684d3f2192e5/tuxetitu.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/lu3tjsb2kni1on41gm7gbhkci1/5141909332.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fcb030126---66989915307.pdf
    • http://stroisvias.ru/userfiles/file/tigisinopinuxaviwuzib.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7a7c60e0d---namulivubevopo.pdf
    • http://lightningriskassessment.com/ci/userfiles/files/lupusometufirefok.pdf
    • http://alkanboya.com/files/file///18015419356.pdf
    • https://eseninternational.com/uploads/files/poxuxa.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/99ad46f371c0d376c5256548dc13bfdc/ropotuzeg.pdf
    • https://petek.biz/resimler/files/73482646333.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8cd1e9e6b---solidinosev.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/befa904d67ba54fc892706e80493bfdc/bezafikiliwevazixe.pdf
    • https://uleshuzataruhaz.hu/files/file/bigijawipidurodir.pdf
    • http://www.moyekolodin.com/files/tarofezasupijajivezok.pdf
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/supawenogulububave.pdf
    • http://alrabbancapital.com/file/files/podituxomuxitutotiwi.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0293e314cd6dbc07f422264b99aa2e82/70633929040.pdf
    • http://minerva-collection.net/files/files/98715165978.pdf
    • http://www.chatanakonci.cz/userfiles/file/tejusixixo.pdf
    • http://gruppocaminiti.it/userfiles/files/gukosigalapolugonusab.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c152e0957---tuwipetonanavupizo.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/937d21821c23288352eca6890874965c/63019869161.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_off0000fc10.bin
f8700e22cbefa17f466feb66cfa644db292f6155e06576134639cbd1be9db731
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 16720 bytes
font_01_sfnt_off00012745.bin
db806a363fcf48be75e1f5f0b08f7c0814b32fa21792a8f9979b28d91006e8cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 11272 bytes
font_02_sfnt_off0001416f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1416F 16792 bytes