Malicious PDF — malware analysis report

Static analysis result for SHA-256 020770e7590c4895…

MALICIOUS

PDF

99.0 KB Created: 2021-09-03 03:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12e4383dac0cab7481f4d237ce869134 SHA-1: 9f53e9625d2a3fde54b3db4f28f3c09545fd4d45 SHA-256: 020770e7590c48958bc139bbbebe662e643a53e4ad65ff511ab47e6cc8733bec
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish for credentials or deliver further malware. The presence of numerous external URIs and the compromised CMS upload links suggest a tactic of leveraging vulnerable web infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://drafthe.ru/uplcv?utm_term=definition+of+preaching+pdf PDF link annotation
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7baa89a17---77729927217.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/eab4bf329d8115649bfa2d38cd0a949a/zumusefoj.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609729265156d---59609278181.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/rojeligasiki.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607893fca302b---dilojenaniw.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/majepogakagesulobabi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3b8376ec---xotivaloxibis.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/14941575975.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a286556bf63---26099608738.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/vowuripotupexa.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/27325722780.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/25009782982.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/gubugumemabusodu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/pbk578v6h4rdc9dgb7u0ma3n89/26604230820.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf72f9e5932---doxamijav.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/gimemumutubaradifadolus.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc231b3c520---15894319283.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qldo4ug3pm438q4qvihf8qc1k5/76511975330.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/40400207014.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/sojeziwaduruja.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaac37c04c---74557097166.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/98991640087.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/bisekozuviviwugojonepedo.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_off00011af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 19828 bytes
SHA-256: 8d8f32f9ab79b08dc1ac1c2519ac8393062f0f31fffddddf9f8093efa9eef51f
font_01_sfnt_off00014e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E63 10688 bytes
SHA-256: 8961e38d0ba6beac08d00cb3ce521a9e9616d6a50ade9bcd0192d589d2b435d3
font_02_sfnt_off0001669c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1669C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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