Malicious PDF — malware analysis report

Static analysis result for SHA-256 664cb264d672fa16…

MALICIOUS

PDF

86.7 KB Created: 2021-09-18 02:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a709d09e99c57183c6b32773c54b950 SHA-1: 0a41b4b143e4db0959990d1c25569e03c2fd750c SHA-256: 664cb264d672fa16f92e375647fbc3f106d07819f667443d39c5e98c97d024e8
196 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which appear to be part of a link farm designed to obscure the true destination. The heuristic 'SE_MFA_LURE' strongly suggests the document is intended for credential phishing, possibly to steal session tokens or abuse multi-factor authentication. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://drafthe.ru/uplcv?utm_term=android+data+security PDF link annotation
    • https://yellowmangocafe.com/userfiles/file/38553526862.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/lemebenusi.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6780bc8c6d97df40442085df67f3c540/24647330152.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/mebiridasuxofi.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3841570107.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/texukolozakurufizos.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fbfdba9ca---12002499387.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/50740427747.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/davebuwawawakafirarizubej.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/legojeraxeniwagofarumak.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/vofinudotigu.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/13272786734.pdfIn PDF document text
    • https://brs.jo/userfiles/files/3441892138.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/45370308270.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/ruzuxemamason.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/jepapofumuvasodogomakigob.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/sizesuvogu.pdfIn PDF document text
    • https://kuepancong.com/contents/files/11460836019.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/51743975163.pdfIn PDF document text
    • http://juentai.com/userfiles/files/24118504339.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/xelopibaxuzerisufonid.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161345f1e2a14e---29912173126.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/64271996680.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/12157116589.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/temorisuxap.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/71281978186.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_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 10512 bytes
SHA-256: 4bb04a6507964f2cd7f3f44d1a528c7fb44b496ffe65f117b6f7e54b8e88d00d
font_02_sfnt_off00011f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F28 17704 bytes
SHA-256: 62dce3367f95ece85c06dbd3dc2081bc7f3527c716880869550db256fa38778a

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