Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3af6b73c1b37ed…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 13:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1b621dba27076b213bd76f0e2feef74 SHA-1: 30c2386ae9854fa4385b4e741f67fcdd2708f167 SHA-256: 7f3af6b73c1b37eda47577e2e036eebd913467f5ee20d86da4f198032bdee751
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, likely intended to lure users into downloading further malicious content or divulging sensitive information. The presence of external URIs and link farms on disposable hosting suggests a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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
  • 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 https://cowik.pl/upload/61094282327.pdf In PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9afcdd2748---25748556245.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-25/20210725034128924586.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/ritidinulobovuruvoxotozu.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/67160467207.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ed0bdb47ff5---23098793244.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/lajebisiw.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0eaed1460---nitarafivabafedotelado.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab169efe32---39134597217.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-8-14/20210814071121278718.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/junarowekemox.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5acb418b9---59935020320.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/70164566450.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/27552374209.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/1094605ceb5fdbd346e27f43751fc516/tifefasorujovekifakumeb.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1de16703f---30311793409.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fbc874134b72c37bfcdafcb2acab9319/sewij.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/21803699932.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/dekugewebisa.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/tobizezijokozi.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/acedebe293e34f263454806908b5e8c3/towaseneg.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec436aa60ed---mewawosokes.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/49847480749.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ttj96tlisolidknahsshuj6f52/saxutezuvif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=critical+race+theory+lawPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 17904 bytes
SHA-256: eb46da932c9e64d8f24b284015b603b714ea05f00175f79a51f3916fba4311f7
font_02_sfnt_off00012fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD3 10288 bytes
SHA-256: fd522754aedbbeabc56e1e81f6797952e531da0cb2190aa79cb3f1376c5339d2

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