Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9dfcefa45484b6…

MALICIOUS

PDF

86.8 KB Created: 2021-08-02 22:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2a9c8016632498406030d2b672ae41b SHA-1: 30285999eaf8ba9a6e2f8e51e56c58ef0f61d06b SHA-256: 1c9dfcefa45484b6ff425815b3a29035a848d15582d77bc77c3c816653563446
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

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://fonnepal.org/userfiles/file/97284964810.pdf
    • http://begemot-rus.com/uploadfiles/file/2021051608003573499.pdf
    • https://2ruoteexpo.it/ckfinder/userfiles/files/poxavusuf.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c285d9cc11d---44419654345.pdf
    • http://orvosvalaszto.hu/uploads/files/35504483120.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/a039540bcfd3b2886b95989d57846962/nazizunopibakuzalivuzatoj.pdf
    • http://feynburg-uhren.de/uploads/97199847094.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081efb6b5aec---gumisonipanis.pdf
    • http://yanarfabrics.com/firma/files/62097160675.pdf
    • http://canhtoanland.com/upload/files/5282773471.pdf
    • https://panelshock.com/userfiles/file/80230172822.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e265c466f---rojazewol.pdf
    • http://pantryscan.com/123cars/imagefck/file/wuxififufol.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/46034787996.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/94888899606.pdf
    • https://whiteplacard.com/UserFiles/file/90094343136.pdf
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/25404794948.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afd153a1093---figoximubemug.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfceba19c59---kipuwaduzalurolakudib.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f5a34e370c3e570d4f687ffbdf2f2b74/tukuvometimitobamafugav.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/b5h34jg2ibk8m1gg14lmsgh89o/jamebi.pdf
    • https://beauti-full.ru/uploads/files/41625979986.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090244207e99---gitisudexafebesabufo.pdf
    • http://wonikqnc.com/upload/editor/file/1625010686.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=avro+bangla+writing+software+free+download
    • 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_off0000f0e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 16792 bytes
font_01_sfnt_off00010900.bin
075b7bb62c1cda24702965ca007af3ecb6b12cd61ec9fc729ce9d5adccf0eba8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 10804 bytes
font_02_sfnt_off000121ec.bin
627b61bb11f7ebf777d35119fdca7dc85d3dc9197d1c9ba5de8506f8a2147fbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 16560 bytes