Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3692ded261f475…

MALICIOUS

PDF

67.3 KB Created: 2021-06-21 02:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 38481a1138a674fe7bf0dbbf4dc939ea SHA-1: 43c414f2928f26853b56cfe2b60141c8348720bb SHA-256: df3692ded261f4754bed4579b2ab458fb5fa36dbc56c030b84175b52ac90de63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and link farm patterns, indicating a redirection to potentially malicious sites. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly supports its malicious nature. The embedded URLs and link farm structure suggest an attempt to lure users to compromised WordPress sites or disposable hosting for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=shilpa+vijay+tv PDF link annotation
    • http://t-p-fortune.com/userfiles/file/32093567738.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/f89b05e82cfe20c96c0d916679b2ffe6/46495023240.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f052c74a54---wijij.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/90546420b5be6dd71e389ec62d5bc671/besepev.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/2e376578a95d00838eb56c9ba3ac7264/53733057227.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/34319499232.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/remug.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815912d1f9d---jujeroroseda.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/c6c8b30aaa6bd0de64c21c77ad318fef/vukubabubuse.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/16094238213.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608917b178048---tavef.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607910b434831---rumexunaj.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d82111fe---foton.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9c2743c70---8866468062.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f9486d4f41f433f24ae19f348b685653/95467856756.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070ccf5ef959---guzevurinobol.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/jigiguda.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f17e330d---tamizivoka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD49 4428 bytes
SHA-256: 9e0a9bc3a74f43e82c965c1b8a3d96b4651027b6c19f5d3aa5f5bae634f2185f
font_01_sfnt_off0000cc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5B 10628 bytes
SHA-256: b82f6f97384d065eb871c7b34825426bca2758b719e0a69f17a4483d1642726c
font_02_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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