Malicious PDF — malware analysis report

Static analysis result for SHA-256 423155b6f180cd6b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 02:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af598aba3cbae210915df15aee773b99 SHA-1: 7d550a8f21ba27f3437187ae8ea5c592e8bc1f08 SHA-256: 423155b6f180cd6b84233e44186cacfa984f5daa65b11020f64672c75546b0ad
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially malicious PDF files. The primary intent appears to be directing users to malicious content or phishing pages, leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/3784c8aba2e50fc165ce96d90fdf77c9/83678356991.pdf In PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/8eebcb754f0c6b18b395539ed8de7717/95947851928.pdfIn PDF document text
    • http://imi.vc/upload/files/pesofanisiliv.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/74983727659.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/90557527942.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132312e66db9---feguxu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6c55c287dd93657d862cdc510c1e65cd/poviwanafovuganozeme.pdfIn PDF document text
    • http://carbontuning.ru/file/fepanad.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/46857412593.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0a7c1212500222f1761f93220b8ffb5a/70033904106.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46e597fe3---75175808882.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/26343034991.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///58803105658.pdfIn PDF document text
    • https://superchills.com/userfiles/file/motaxexamusisirulo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161314a98cb09b---26689316491.pdfIn PDF document text
    • http://z500.si/files/28567487034.pdfIn PDF document text
    • https://theurbanthinktank.com/files/pepulawos.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/91356469265.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/daxudupagaduse.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/57097434725.pdfIn PDF document text
    • https://kildevangen.dk/files/9763307871.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/fixaxizabawajul.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/dokelewijizasawajevasav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pair+ps4+controller+to+phonePDF 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_off0000d76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 18924 bytes
SHA-256: 5ef0a9a5f98f8fe8858b33979d52977e6aa8d020b4c3857083d07ce86f3de479
font_02_sfnt_off000120bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 10552 bytes
SHA-256: f542c9410d70847346ab446cc26263d2be1c781f740e2ca8cf892c02841b0c0c

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