Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3d0b061c9ab460…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 10:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef5202700b133a417a4d8389b69a54e8 SHA-1: 5cefac70219485508297364dfefc3049e74dc204 SHA-256: be3d0b061c9ab46045a1d44a3a7bd586c87c4314431f7e57460d48b622b595fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=phone+root+software PDF link annotation
    • http://yoshitomo-kokubunji.com/jcfiles/file/74807095390.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/68306868360.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/63388043199.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/362559083.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/tavasosibufatokanedoke.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/mujogeli.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/99648031245.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/10336111930.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/mabuba.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/26486572833.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/bemovavifutiroga.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613012ad89753---34605018209.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a218d47653---totukuredomomigibikipava.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/95095230875.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/22969776471.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/fonijileru.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/53193580345.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/purexawukelijujifato.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/kixokajobisoxezazowomil.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/lekufojiwa.pdfIn PDF document text
    • http://juha.be/_files/file/98340804617.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7c6f44b08---64995862189.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210910_115232_4261.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_off0000da24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA24 17800 bytes
SHA-256: efdffa1c2d1c756ae7534b5951fecfbe9da521f2dd030f9df9be4cea9e516b72
font_01_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 10260 bytes
SHA-256: b69e62860232d6f82c81a07066b489e16b67c237d14a91b4649a09ee0cb365c4
font_02_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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