Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c89ce954f5c2cf…

MALICIOUS

PDF

72.5 KB Created: 2021-05-26 14:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47f6873e6eb69b0912fe08ee61a0eb8f SHA-1: 329d62ef28b02e236708323dbd8d6c8f63dc8940 SHA-256: 52c89ce954f5c2cfb83afd3ce7e6d34526946b68f810e9e0f71c94bed0257780
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm on potentially compromised CMS uploads indicates an attempt to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7865

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://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609630dc29d51---43441358208.pdf
    • http://suamayin.biz/userfiles/file/22234161943.pdf
    • https://amblamy.ee/upload/file/42456734120.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c9d05ccdf---sunajiwinekaxokepegoputam.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f6c29f3b0cffca56aca7c62b5297ae7d/jopuvogijomes.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1cb49a2043173dd74d94e3b4c608bd09/15434777837.pdf
    • http://goldartline.ua/userfiles/file/71596024967.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099a233d6274---gadowulumajizet.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/1l10ma1r9jioc0ru4vb5c96r5o/ranimuvu.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/7096f73832ba055967f25fe981b35f44/xifomekafurisu.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb1c9e864---saniderivopiz.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qq54h06iefji2tavd1h41vh6b4/77749004724.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/5bb24b423c58df3d663c68dcc777e941/48324065757.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2rqjm8q2mbh10idmlbvuv65ku3/68367766518.pdf
    • http://apsara.ru/userfiles/file/54018159432.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/vfaoa9b1ps3f20rgven5fc2vf3/82657115259.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=inconnu+%25C3%25A0+cette+adresse+pdf+complet+gratuit
    • http://scripts.sil.org/OFL
    • 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_off0000d863.bin
f68607aba715a6c7c77b3dfee34f9c3b898a3a5b443420ce13b6c99e251d4c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 5644 bytes
font_01_sfnt_off0000eafa.bin
5b051208c1f54ee85e19af05c4c0f1f7fdf1425a587943d3383d7970727809a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 11972 bytes
font_02_sfnt_off00011029.bin
9c7926b8929b88a1dffb52ec04bcfb477868fd459509337312ce674bafabbb6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11029 16192 bytes

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