Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea0eb78b7ef4122…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 12:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0fd8a14f61c2b4dc1ede58f8ec2619e SHA-1: 3ec4c768265c1842ff9db6f09d10ae1ee151d892 SHA-256: 3ea0eb78b7ef412241b6c668b2d27133bc478d3bdb34ddbbb4c1ab6f68c51f84
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm or phishing lure. The presence of 'cmd.com/data/files/' in the document text, alongside the embedded JavaScript, indicates an attempt to execute commands or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.la-rocca.pl/app/webroot/files/files/fusum.pdf In PDF document text
    • http://ahcxdq.com/uploads/file/202033241601.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160953fba5f703---23723482097.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/tuvibemim.pdfIn PDF document text
    • http://18554080.com/userfiles/file/wivipimuxalikawuk.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879f5cce348---parapanejaranerisakazeda.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc9f048fef---bexefat.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/47392383544.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/25726335583.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/27aff3ab9f04611ec2f344f3d3520b73/56613655879.pdfIn PDF document text
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/suvinolebonanofoni.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/80272750440.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b85252073b6---69593633989.pdfIn PDF document text
    • http://candientushinko.com/images/file/23388474657.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/wulotunatinukivimu.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/4397212400.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/tusovojujulupamigadovu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/20083484421.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/cvfsidpo3uitjuudh921srhrr3/91523854646.pdfIn PDF document text
    • http://classtool.info/upload/files/50192557747.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9bf09c08c1e4aceeea7dc00e869ed805/14098692575.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa3e8cb325---3627378954.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/91358630993.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210825_90BF453E027955F5.pdfIn PDF document text
    • http://qdcmd.com/data/files/xuzuxolameke.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c8d43666277e947b47cde288f39e09e5/gifajenezevab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=2018+calendar+pdf+with+holidaysPDF 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_off0000e5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E0 11324 bytes
SHA-256: 1b5fba1e06fef96d7cf1ecfc30ca3ebc18bbbc33d6d8653705df9306ecc057d0
font_01_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 17344 bytes
SHA-256: 5c7e2d984a944166ba1b5f9addf765a5835aeff41e7b89efa4e40b35aac25b38

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