Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40d4f5ab2396a5d…

MALICIOUS

PDF

85.2 KB Created: 2021-07-21 19:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ed0103aaf11364000343ca6fdafa090 SHA-1: 0a8b1d27a41eeb76874d62c28953d3f47080fcad SHA-256: e40d4f5ab2396a5d2b66707120225b17bedd2fe2bd6e69015d88fbd38cb84e62
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and numerous external links align with a link farm attack pattern designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/997da031173120bcf6bb0c7aad2ef426/8942931252.pdf In PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/stktll77bsnmebsjlui3ug622d/90144563116.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607968953819c---toxijovo.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/36348657015.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/311145288905.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/39572848910.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607267970a18f---98188958195.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/96ea80de74a476d86439aeaeb3d42c71/jonofojuzibiza.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/69cc1320072e3f67156fd41727e72e06/zinetorazipobemituk.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e428ec1aa31---33466338404.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/hqmv511e5d5nk21cvcebscmhq0/danefuregog.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/19415774775.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/58863323743.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2a07acb71---tovoda.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793976010eb---48231012567.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/zaxitonuxitisekajejefen.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/joxowil.pdfIn PDF document text
    • http://htcable.cn/d/files/gowosozasuwunata.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/21118273969.pdfIn PDF document text
    • http://ping-property.com/user_img/files/37656039588.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8adbc664c70410486f011e5d5947a2d6/jonuloxusanonaburuxojotep.pdfIn PDF document text
    • http://www.siposferenc.hu/html/46375720555.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/90504682233.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/vubafuzaxuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+be+agent+in+club+penguinPDF link annotation
    • 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_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 16616 bytes
SHA-256: 8ae6bbf66108353e1e751581bcc83fd894ea94a5e8d003f86294e79a09b2d43d
font_01_sfnt_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC1 10600 bytes
SHA-256: b1ed4df53613855ea5a2474a7cfbdebfc3d1ca151b0ef7ca012807c15338c2fc