Malicious PDF — malware analysis report

Static analysis result for SHA-256 141bb765fdc36aac…

MALICIOUS

PDF

100.5 KB Created: 2021-07-13 20:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56a35d81008c540d40a505bd0992bb61 SHA-1: db55aea828bc4c11e9f4ba2a55744a84f17e056d SHA-256: 141bb765fdc36aacdf516ccd25fcfe41d33491eebeb31d3c7cd62a3655eec52e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://catamma.ru/uplcv?utm_term=the+unstoppable+force+wow+title PDF link annotation
    • http://marinapogon.pl/upload/file/17838595877.pdfIn PDF document text
    • http://bwc.lt/i/bojijo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/n4cvokhuj2j35gtn35j2qhesnh/zutumuzataxijerunowedegu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4df3eda4---zejabemuf.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e69f473674---7278071367.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/9161def72379c579312c0cff6568cc5f/36442604565.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5eed6caf02292bea172d690cff8b8d08/20567597668.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075e60fbb183---pajikamilajomuj.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf3056beda---dulinife.pdfIn PDF document text
    • https://medius.sk/userfiles/file/59324227307.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/18577533601.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/jufajukiwasiwejonatuworok.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d19bed313e---bodomojatavorebuva.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/cdcb1c610b0b9c92279ee417cb325c34/tevatekojobogavekikil.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///68602531293.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/31503048838.pdfIn PDF document text
    • https://abeess.com/userfiles/file/jewumorakozexan.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607307f81bdc3---jinexoxoge.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/5i2117u5kb9uscp94fs2pai1n4/53169288099.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/rozevupaz.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/91777891079.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/64ujjq4pqjblr7e5nd4ob9gqv1/32831404819.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4487c0570---18599992541.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085dbc1ef4e2---bosuro.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/76877746715.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_off0001274c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274C 17132 bytes
SHA-256: 34c105408169a8424dd2bb3cbf988890f860b9d393ee3f07c6204d55112eae80
font_01_sfnt_off00015393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15393 10864 bytes
SHA-256: 842047cbe78d264c36cb71ffe4446872d904cdd0f26518cbfa537feac8a62c18
font_02_sfnt_off00016c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1