Malicious PDF — malware analysis report

Static analysis result for SHA-256 5620f577f469e46a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 06:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8908f40b9cebeab9dd4c5d94bf83d8f4 SHA-1: c7fcb26c47d4c62a92d5da65f72cbf35948d16d2 SHA-256: 5620f577f469e46ae509369a29390c84485fb9031ff390797d95264d4414d51c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites and utilize UTM parameters, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=memorization+techniques+for+kinesthetic+learners PDF link annotation
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70f887fbd---tejijajusipulamoze.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/xezar.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/litel.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/68998132355.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/15017310546.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/69459915250.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/65649994450.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357823ae640---boranifamonubuziketexeju.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a573e5dc1---kurubitaziwaten.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eea05e08b0---31589263244.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/votodozumefopanoret.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab26b174e---goloxufolu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1b42d2a3---17759102913.pdfIn PDF document text
    • http://canvangdientu.com/images/file/72845684848.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/sodepitilenopesejozabave.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/sozirubumojesuvediwob.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/18462288636.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/70132440164.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/58064486086.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/gigulawojifapida.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/8206306550.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/62204480431.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/92751917969.pdfIn PDF document text
    • http://kelvista.lt/images/files/67555287732.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/40196008618.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_off0000cfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 10992 bytes
SHA-256: c09538e7ae9f68e9d1e2d2cc2e1614f42a186c6f801cfbb107115759b9a013f4
font_01_sfnt_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 17336 bytes
SHA-256: 81338df42bd472829e45f17c112ec6f66f87c523419aef57f6afbc21679fb3c6
font_02_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1