Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d83ede99df5cca7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 22:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 196fea58066ac5c0d427ec55d2316a3e SHA-1: c49709fcdd17a694cf1231de70eb07f0aa08d875 SHA-256: 8d83ede99df5cca7b853cb1f0578c51c8f6ca938a243c41074d6908277e638d7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e40ee00334---26827200195.pdf In PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/48880667079.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/gutovino.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8cdaa449f9b06ce7cf09207fb2f1c251/fodexotomarajefaxoju.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a7b6fa51e80e82647c1661a5d3ae36c3/lofilupukusaporixip.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/83029217676.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hfmpsh9q0q4v7h5lepv71posrl/wuwififurov.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/6t0128p246e31c6qbisg8fs0g6/73611726102.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/98914203722.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b683cba3304f46e89ffda63937bfbbf2/wagobirinebugemid.pdfIn PDF document text
    • http://momsystem.ru/public/file/xujisu.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/mijalowalamelijeborajusi.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b122434955a---64819332751.pdfPDF link annotation
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609be99900c4a---fumurobopagava.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/49318e835969a69b78d4a4356eaa1fc3/52387082400.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/gowepax.pdfIn PDF document text
    • https://pecsikult.hu/files/file/5881346177.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608962f255eae---sorixoda.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/jutulidifutekevabidozat.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/zegowigonolalisorowedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+reformed+theology+rc+sproul+pdfPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/95092512386.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_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 11172 bytes
SHA-256: 88ecf63720a29e8f6f2b970a20c1f0352975dd1d483657a346b8c5bf0b37303f
font_02_sfnt_off000110ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FF 17200 bytes
SHA-256: d5c19a1ab96dc2b847e0ebab7ebd3773234c72301f18be5f000adfcc6ffc67d6

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