Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4fba77027930bf…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 04:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e2c7c9d9971a605649a39b3b0a03dab8 SHA-1: 5624bfa5c2f0e48bc7b0eb4cae8333688f58e5d7 SHA-256: 6b4fba77027930bf94c4f02348314ecbdbaacc5826d2a68da3f79935e18de515
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to various domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing attachment delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://krisoc.ru/uplcv?utm_term=nuclear+mitosis+in+fungi PDF link annotation
    • http://am-assets.com/aom/magnolia/userfiles/file/novabebikatowozotugamogaw.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/lesizibigut.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/47f4e52b7542262e0821925e85afe9d8/variruvap.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba97f622f5---bikidatoreletel.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/lizalozemodez.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/59232389741.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/34993909370.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16086c03b76ebe---nefemisesotu.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/83277821942.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/lesewuguluwijomazuzivoz.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a30d8e827e5---80016107366.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/32282671922.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/22062618097.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/3ea35476b6147c51c36078ad9989803b/71573586776.pdfIn PDF document text
    • http://proxima-design.cz/files/file/zuxolikatup.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160823dacabc7e---80830892020.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/bivirepavumojiruseb.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/85444967741.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/ec6540fc82b6e61e637d6e96f3ff39e7/57641639011.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mksek2q7mmhb3drbas1gip51m6/wepigilibame.pdfIn PDF document text
    • http://abnicum.com/files/file/zexagatufademuv.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0afcd684ee3c855a0e2ea1227eff3e14/59846373629.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/jojaguzotewinuwesu.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_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 18100 bytes
SHA-256: f244f22b69c49f241f7450423cc1fc59c4033f737ba1bbacc91f22788dc32314
font_01_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 10756 bytes
SHA-256: ca59ab6ee5dc35b2e4af06b51eed0d9592a5ef23797fe1fe35ad4c3eb474ef8a
font_02_sfnt_off00013755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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