Malicious PDF — malware analysis report

Static analysis result for SHA-256 868c3d6713b18fcc…

MALICIOUS

PDF

68.1 KB Created: 2021-05-07 00:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82687e14df37b5d7e8d0f3015be356ac SHA-1: 4db47fc478b95a726dfaa5aaede29ea89b74c2a6 SHA-256: 868c3d6713b18fcc2fad359c88a5af670debf464609b3cebfb29128ab812c0ab
154 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 functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content or phish users. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support its role in a broader malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8569

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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092042c6322e---jipuvafujefararigumexokak.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160705c1cb9f2c---49233286742.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/93ce46cd98317bf22bc6dafeec3f306a/4533153085.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/344a8e235227407cb8e64ce47b928253/vitarateju.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c00aadddf6---54785984941.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071961726c0a---43249962469.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923a72bd708---85687224876.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f840fe6afd8e6d3c3f315e9f4885ed93/xedanabisa.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606da1a5bbc38---jawano.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/98b8e70983352c4f2018d642bbd4a207/29951910305.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/c5bd46ce2b7139b4462f3721021292d7/22146595696.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff51eba14d---59842271101.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607344e29b7e4---2667235511.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/7e1df9f9e53e86638fffef814b4f1e8c/nukulefawokimivebon.pdf
    • https://anmoul.com/userfiles/file/katidafidekazivipujo.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1d8892cd---12294637623.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7d405d29---powekakikevevudode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=maraudon+quest+guide
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea9.bin
3682f49bd98471e10d2f6183206c55980c8ae4bbcbc5017d1e7f79bb53b429c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 5092 bytes
font_01_sfnt_off0000f00d.bin
dacb643690660a5833ae9acf0d2a09f627d2b14c9d47d9416766f5607d98621a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 10164 bytes

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