Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28238f8dcb71120…

MALICIOUS

PDF

88.4 KB Created: 2021-09-08 16:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8dc3aefe5d8d3a997d16a60d9907baf2 SHA-1: d72eaff021aef81addcd6d4dfa62e6d69849593b SHA-256: a28238f8dcb7112003441b0dc4c52801ac18d5ac3ce2f58a4fccf7f6b1107823
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised or disposable hosting. The embedded JavaScript likely serves to execute malicious code or redirect the user, while the link farm attempts to obscure the true destination. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.siscbolivia.com/admin/uploaded/fck/file/94332444531.pdf In PDF document text
    • http://novichiha.ru/pic/file/98022411790.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/45b6ce79fdcb48c001d64b5f5286f63c/koxagezotemezudoluxukidid.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/57640179678.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d03bb728f---37475623290.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/tulaz.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/babeduz.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/puwedejidiluboveduz.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/kigut.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/bipetavufizusunowitug.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d79aa6af2---63542330072.pdfIn PDF document text
    • http://jump360.co/upload/files/20210907045145.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/19561953501.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/55374154821.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/12608986731.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/sipodebipapofemujepejezu.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/vorusafefereke.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/20256303210.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133807188cf0---4934859286.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/83828793092.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/nigezopifodatejazas.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/xuvosozabetipa.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/19989018837.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/bitazefagugodidaj.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7a6971e7---kelizaj.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fffcf19734---tekipilaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=benchmarking+in+tqm+pdfPDF 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_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 17876 bytes
SHA-256: 71019e2b8cc2cb9d31570c8527b05eae88ea728a8bcdc1cb7c7ec92478372c6f
font_01_sfnt_off000122b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACE 11024 bytes
SHA-256: 494183ca6e2cacf34280a3cc475502a7dccd38b5318d12c2a46da54b4c30fd49

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