Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f570f70f0b4eed…

MALICIOUS

PDF

102.7 KB Created: 2021-09-05 09:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ffa07cfb97b6fd2a99341bd9e528274 SHA-1: ed5593be8ab63eedd5ab5cb192cbed3004d9959a SHA-256: 98f570f70f0b4eedd1b79da59a98a1e7604492b1ede0c1dd88ba37b4d43c8849
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://onyx-innovations.com/assets/ckfinder/userfiles/files/foxekuwawiriferu.pdf In PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8ddc8adb5dd3af80f0b952c89b8ab5ea/79555704603.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/50292615423.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/3765757600.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/li1qi0jvms3kb40mem3vufjcb6/18395142553.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/tqs4kd1vscb09ms5d4g9vbnstv/65090240955.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084dcd1390b3---sutelukel.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/21977622510.pdfIn PDF document text
    • http://babamoleskine.com/files/file/gituzofofi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609af51cddd27---tuvopekolowemakoba.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00a686d49---jupuwuzidojatisileku.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/zapigadifugonubi.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/24357988756.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e9e1eff0---19649097463.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/62975034571.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c691dbecc---92808294544.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/7c7bf99fdb36c17dc395f798b0c06d8d/21163079700.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607fecc373384---15586359027.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/38430022243.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9181e136d54d4372423159ddad0842eb/55634429088.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/zorakenim.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/dumenegexigazekopewo.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/gewoxopegejewubugum.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975c8d2bf09---gufofugulilutilofunaki.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9564ae917---21086834959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hino+diesel+engine+workshop+manual+j08ePDF 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_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 11472 bytes
SHA-256: 104a54ce9ecdced68f81c1c95a0e9f1718eb8267654debb848a084208dc27515
font_01_sfnt_off00013ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFB 19832 bytes
SHA-256: 3cd9146c40e3f6aa4f4fbdb549f6c2382da2f2cf83fdd84db71f0870c69b223b
font_02_sfnt_off00017466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1