Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a289ce0a97c955c…

MALICIOUS

PDF

87.4 KB Created: 2021-06-30 21:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0d69e668d5df2cd5a9c92199e14f54ab SHA-1: d721a66bf9533ce4edaa188ba08da426ad3a8872 SHA-256: 2a289ce0a97c955cd59e483b2e71da56b3067e557f1d83f8b3abca853fac1744
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. It also features numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://oniceh.ru/uplcv?utm_term=shortness+of+breath+due+to+stress PDF link annotation
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/87f8fe4e72df828212295548ec0e7c19/fafarekusefidamaj.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e226a575---sexepu.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/98878083643.pdfIn PDF document text
    • https://birudongker.com/contents//files/93526027753.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5a78bc6a0ea95f09f13177be4e485bd4/7658020235.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/10c605a67f096a03dafbabfb61d95561/93244940052.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba92825fc19---tadawupelemipuzorojew.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/qnh5hmbi6uj06s0qctj7juvvmo/44762335960.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f795648d2b---rawujerepepojozunabobiri.pdfIn PDF document text
    • https://computerzone.pk/file/17098619889.pdfIn PDF document text
    • https://actorconseil.com/files/file/rutumejanoravawukal.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/17277638908.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/23104868074.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/90465922430.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe8f1dc4fd---didebudetoz.pdfIn PDF document text
    • http://atomleasing.ru/media/File/28854021499.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084267716f53---vomimepolezasubu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24ff605be6---xilibifinekarojodat.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/32334965359.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/94286333048.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/5537314846.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/47v8qd2on5dbb6ft3kci5jel7q/91822381988.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_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 10628 bytes
SHA-256: b9961c33363844cfe63800eb6cfd325cf88a2af2ade04cde5fcc39b3f4dc5e8e
font_02_sfnt_off00012341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 17152 bytes
SHA-256: e898e13e844527e3b858d1a731d7d14786451da3e3e41da298402e5a378afdb8

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