Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14da44c8f6d2c8c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 17:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9975707004907362733d96a261dbd949 SHA-1: 7ae29a78eca85fed028920b727c439f46df84f2a SHA-256: a14da44c8f6d2c8cdc339bf612cd13cb07825e7dec6ec98cb7cf5bd3246da168
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=categorical+bar+graph PDF link annotation
    • http://phamtrangia.site/upload/files/ketasime.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/6958567246.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/21543825022.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/jetegixusurisuvuf.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/disepefivomo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420ed0efdc8---kirij.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/88340447420.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/latut.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/58092836054.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/85972372327.pdfIn PDF document text
    • https://mcsfood.com/images/file/befelozarudozuxewubogibag.pdfIn PDF document text
    • http://canadianrockies.info/files/file/gojifedidazotubu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614217f21bd2c---kupap.pdfIn PDF document text
    • https://jotelek.hu/files/file/79289970557.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/retogasolil.pdfIn PDF document text
    • http://hanleyresources.com/images/82086482028.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/21823670681.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/niwatelunipe.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/bomunumituwakoxorupixi.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/152a50212cad54255aa57ef3bab69781/77017738284.pdfIn PDF document text
    • http://benly-carson.com/product/files/77124767685.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/93084106356.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e4748386ec35c3deb1dcf0dc9519c47d/rurevugaxogawoxikitoziwit.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/57990240131.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210910034636.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_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 17416 bytes
SHA-256: 98c0805198ce93f7f9e2bdb3a3835a2aa896b0f243efb9178e76bfc363b563cc
font_01_sfnt_off00011270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 10552 bytes
SHA-256: 23c8753126cfd5e27f751f924722181ac15384273895d7a27e7ddea292fadd34