Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd18dd654048dd3…

MALICIOUS

PDF

72.4 KB Created: 2021-09-05 05:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f18dac04e374f2a9de908ed2899b3779 SHA-1: ddca9d0eec296f5e5118e35c60a4af7f9cae4bc3 SHA-256: dfd18dd654048dd3a854b1a0ee7d052a7c4c61be5554916b63f2da589859263b
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ville-dammarie.com/ckfinder/userfiles/files/44628165456.pdf
    • http://studioriboldi.eu/userfiles/files/47604057107.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/43940eec2e739dd94e33d33fe97e3e82/44987384127.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bac520bcd75---22369230060.pdf
    • http://divorce-difficile.fr/userfiles/file/17026416896.pdf
    • https://elegune.net/files/galeria/files/mimikibim.pdf
    • http://aaaexpressac.com/userfiles/file/gudalipaximuxomovuv.pdf
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/17672391970.pdf
    • http://coffee33.ru/archive/file/66237369377.pdf
    • http://www.pattyn360.com/upload/forum/files/6757938460.pdf
    • https://webmenuplus.com/images/file/68469271217.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613000f07ddb1---lefog.pdf
    • https://dbjadow.pl/attachments/file/66138748071.pdf
    • http://adamlegal.com/userfiles/file/8404017709.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c1d66e23e3505eddf0f78719fb674ce3/xigudadideduvumewanopiw.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/3ef756b7a4c06a032d975e5f54521c97/90405693133.pdf
    • http://njboyuanchem.com/upload/files/toraxoputimagopis.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06aa19b13---4280887280.pdf
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/67881800740.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faa0113d310---towuxefux.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/53b831155adac54af0aa3a2f602569ce/59972665133.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8b7a077f---90104923838.pdf
    • http://jun-travel.com/userfiles/file/33909762854.pdf
    • http://unionnutritech.com/upload/files/831258918.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=curso+base+de+datos+sql+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_off0000ba31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA31 16792 bytes
font_01_sfnt_off0000d248.bin
7145d1b94192ab976bc9401afbd8eb644fbe81542557dc633ce99cff751e3da2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD248 10712 bytes
font_02_sfnt_off0000eaa2.bin
6d1cd2ea1288cdac24f70198e437227b60bdf86530f86952d8393250e17be45e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 16592 bytes