Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cab8cc8fd6b3c5…

MALICIOUS

PDF

65.4 KB Created: 2021-05-06 18:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e339aa1199c4ee4740f2f73656a440a6 SHA-1: 4ee11c1802a101acae218b51429af002ffd2da2d SHA-256: f8cab8cc8fd6b3c56c23fcf6ee3454fe3fb5040edd219d754c808f99d8a34ab0
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The primary attack pattern involves luring users to click on these links, potentially leading to credential theft or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

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 https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/ccu8of7ot2l7o1seldp75k2et2/lexuperasijajubopabibumox.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22cbc8144---mupima.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091d1c247e9d---40046526303.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d21a0f1a4---mapojux.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078fcaa89a3c---zamonabif.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee4f490235---98579532956.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/a8nr4ammug9rlvctck6v0i2cma/18584887468.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/68809498165.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/avul6hdln9ql8chsu53ol0b8b0/28953625253.pdf
    • http://afghansolar.com/userfiles/file/62832510957.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/2df64dda1079009add9a7ef53a8e5ec7/gotokunokabolugatilu.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/suximugogufe.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qn5l9spkr0g9afi2gquu0ip6ep/96153906662.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/r2j3t5a8nlvei7ebi2n7a6gsk5/45749538785.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16093f66a5ba86---xasabowiduxud.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608147382d07c---rewugilodawadirusove.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/56299ecfc444701646f6e286d6e21cb8/nuwobojug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=copenhagen+airport+to+norreport
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf2.bin
1cf67d02ca114d12dcc8ed7594a4ed351c28f7e475f67864be8a82fdca031ab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 4680 bytes

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