Malicious PDF — malware analysis report

Static analysis result for SHA-256 a777f40754637c85…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 12:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fbf989ea65ab589787202e65e04a336f SHA-1: 72876728ec4506e212f4c994a3fe41d2dddd5cb1 SHA-256: a777f40754637c85879d6569cac6d87f5ec63a0892c5c6c97dc8419072751cd5
156 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 it is a phishing or trojan distribution attempt. The file functions as a link farm, containing numerous URLs that point to compromised websites, including WordPress installations and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cructi.ru/uplcv?utm_term=irs+casualty+loss PDF link annotation
    • https://digireg.org/upload/zawupekote.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34878eace2---wubazafope.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210625201040_i6dlnd.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/53022866453.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/wonupakofebepilitokipobew.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/63f076ed24444ed273471cc44f84de1c/noviwubudujinitoxox.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/95612826751.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b307d3b9973---47051164843.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/51895633299.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d3f0845f9---wodejuno.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/82617267950.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210815014327.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ed984cf3a---48787490734.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/708f529d88e166f92fd6ec60fabe8483/32854100598.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/nozuf.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/menebef.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/3964018151.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/vifabobiru.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/14177623968.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/famvcb3ng55esfqu74nuu5r6d3/fuwivitujabadimazoxole.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/14804745723.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7abb0dd6f26cfea312e36518674890e2/wumejasewavefexajikira.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/70865976793.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/2588392376.pdfIn PDF document text
    • 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_off0000e556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 18008 bytes
SHA-256: be0206a5b1b86c6a582d17540fd8529aa5bdaf833ea611fd2cc471129dcbf8e5
font_02_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 10060 bytes
SHA-256: cda180914f1b7986032d145532402959521f75fd60fadb996d670ac15864776c

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