Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d694b694d84b3a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 08:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 052678cbfa801adf4b3d7041e6b5eb22 SHA-1: f311fbbc10d2bab6322e8c1affd5f1f0bada3eb9 SHA-256: 56d694b694d84b3afacff5fe4056cd79fdc3ceaedae2c2bd0da205e08fff5ad0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The presence of external URI links and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wastran.ru/uplcv?utm_term=can+we+earn+money+from+telegram PDF link annotation
    • https://zzwgjx.com/d/files/29867114641.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/55686876557.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/wakibajize.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55dce7bcb---gogojitotem.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fa24a4ea---nunubupowimefomadiduxupap.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/dotudiziwu.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/57768857279.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160851b78724ad---vovuxawadologufejevub.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/nerozusisubegezavijoxusu.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/42629491903.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/71147949867.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c930153f678---94999637317.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/67762517787.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/37087558008.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/49838851142.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/94635416864.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/86193920902.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210801_2A070F8B593CB4B5.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e51fe63fef---fagilunure.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/icqc5lmkpc0cf39bae9k2odu9k/nuwenegosaragi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/cpu4ad8c694hlnqp8kfpndh69n/48834005668.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/repifokuxunif.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_off0000dc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 10528 bytes
SHA-256: d53dde8647d4c5e048ae3517b2c5268014194a731fb5fad49f3ff974f70f99be
font_02_sfnt_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 17820 bytes
SHA-256: 1500a4586a839eebe8985c958410d32b0b6209e69697e055ccf537374c3cea60