Malicious PDF — malware analysis report

Static analysis result for SHA-256 82531f223122e434…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 12:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 206d358d610737af6b7a7c2d03a49183 SHA-1: cbfdc9819d1d6e4f6d9e92062f7f563a356ca234 SHA-256: 82531f223122e434e92be6228ebde143ff57011976f15cb9bf14283b2339c3ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it is used as a link farm to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=philip+roth+portnoy%27s+complaint+pdf PDF link annotation
    • https://kfmaccounting.com/webroot/img/content/files/2535583558.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/9mh2o284k6c366a4apnhouuk1c/51196326077.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/gitaniriwepojerati.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/vujopav.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/91359932361.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/muvoleluxajojo.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/64155297186.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/zizosowadito.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/98564292626.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-23/20210623015425109097.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/80d653975ed7ab3ac8e10c2315730ad3/jumuk.pdfIn PDF document text
    • http://risme.vn/files/zuwitugazup.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/19467582023.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/bunejazuzejufafegin.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/12537715613.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/35221990874.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/38566980811.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabd25021fa---dekazupuga.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pafeegmhjqkpp5b2pcjrce3al1/jenejotizuzutifip.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/afebbaea43baed2236ce44efcba78872/xajum.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/56d8c4d0c06260d4f2a9c503ee50f61c/xijixekalabawiruvibude.pdfIn PDF document text
    • http://jdjfjx.com/images/upload/File/xikopifuw.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 19068 bytes
SHA-256: 62bb17bf2e2b980d83c72ee12d9ee5a86b4bf9b66b080c567f51e4978bcd1335
font_01_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 10900 bytes
SHA-256: bb1a7218de1191daf978d2430678b443b322bcd2832038e8b35d730efdf37b71
font_02_sfnt_off00012a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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