Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8c110318df26ef…

MALICIOUS

PDF

106.2 KB Created: 2021-08-14 12:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e044742761041c8593596ccee41dcc6 SHA-1: 7cdd962e7f8893c68cd8c6e177aea5298acf1521 SHA-256: 2c8c110318df26ef3578cd1b569dc648a0b2a25efa2dc9c7e089e082077b948a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/rofaxabebisukugofu.pdf
    • http://skrabl.pl/www/rpbd/fck/file/tivixovi.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f785a06838---losuwarid.pdf
    • https://tessuno.com/upload/files/60d673732e641.pdf
    • https://luyenthitoeic.info/userfiles/file/xugax.pdf
    • https://bursac.net/userfiles/file/24663204990.pdf
    • http://www.mostenpo.jp/userfiles/files/36306193665.pdf
    • http://bright-mineral.com/uploadfile/file/2021052621423418.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110648538858---21030974094.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4635ee666b---rilekokopad.pdf
    • http://co-wemart.com/careeruserfiles/file/nagikedu.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/dd621002e71d4e8e3b29fdf083578232/sixonavovakur.pdf
    • http://seamacros.com/upload/file/71208945123.pdf
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/koduguwufinazopizatovef.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/iis68hmo8ds735botb31r7q8hq/29625706065.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/41f721f2acdb09c9cfbad29d72bf872c/totudupavasur.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3091bbe7a4---xejus.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/9579008896.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccedde914a---78880507795.pdf
    • http://websurin.net/UserFiles/File/neviwuvodezedexumel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+difference+between+e26+and+e27
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 16792 bytes
font_01_sfnt_off000132a2.bin
617208b87950c43f19f95e6c6cc2d6a197e2e92d618852b97ffa14aa488037cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x132A2 18444 bytes
font_02_sfnt_off000162ae.bin
f2f7e1ea1e15e4977022b4e563f3b48b1cb636d115580918c2931e8fb4d4cfb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x162AE 10964 bytes
font_03_sfnt_off00017c2e.bin
052026ed48371e6896f23e7bc648f716b8d1ff4804bdcc0a518ece9c83a68d22
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C2E 8744 bytes