Malicious PDF — malware analysis report

Static analysis result for SHA-256 862ff21c06a618cf…

MALICIOUS

PDF

73.3 KB Created: 2021-04-29 13:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b4decf8637cb289261252d1e42b670f SHA-1: 8b6699c9fcb84ff83680807e7fd145cc38df15db SHA-256: 862ff21c06a618cf366a215d06fbcffd06badd76462427f30696b48eaf535477
154 Risk Score

Malware Insights

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

The PDF file 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' and the presence of multiple 'formcraft' and 'super-forms' plugin upload paths strongly suggest this is a lure for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

Heuristics 5

  • 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
  • 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://alliusie.com/userfiles/file/50112959180.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/56e4045305fe0e2ae7e858e5401d7e0f/lirexizixotobelusozuv.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086575bbe265---29932967038.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071291c3b388---xomolukazutod.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078327c7ff9b---dewebasilawitevarin.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/edb8b2fe133567f318f4a8345ab24326/81306391362.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31b3d9256---17655998828.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/93982f93a449293b58bc7c88a6df8870/sojenejajusejiwu.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/d99oi56bv5g2lqnnqe26cjm9bi/gakowujisim.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071a369081b4---54637552262.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea689b35c---74473746551.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b295c323cf---52797307116.pdf
    • http://www.contectrade.hu/fckfiles/file/27527378376.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=suspicious+housekeeper+sub+indo
    • http://scripts.sil.org/OFL
    • 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_off0000cd6f.bin
cf3ac237796b0f8d881ac7081ab9f75667c6b75b6ed4c5574389d79e512f21ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6F 3792 bytes
font_01_sfnt_off0000daf8.bin
32745988899d1074eadbc5032167db0b3ca7b99d4baff3c35763edd95fecf6eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 5028 bytes
font_02_sfnt_off0000ebe9.bin
6099c8c3d2040fb258c4544e6b114c74241ce22033ebc25b4602436a8e6e0f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 10928 bytes
font_03_sfnt_off0001113d.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 16204 bytes

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