Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64bc487ab153829…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 06:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9f6e9b39d0a13d583ce5941b0fd9f94 SHA-1: f12b92a52f207121f4114b7bdef474659dbc7e1a SHA-256: d64bc487ab1538297985e90fdc1bd7ae7942c8059f42df3f6f553caa21085ee2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to disposable or compromised domains, indicative of a link farm designed to host phishing lures or redirect to malicious content. The 'SE_MFA_LURE' heuristic suggests the document's content is designed to harvest credentials or abuse multi-factor authentication. While no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence score support the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=card+ui+design+css
    • https://vroa.pl/chplusfiles/file/pewejawa.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fe97147878120edf52add64d0fd4a447/jaxavomuvakakul.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/03d6010da67010de566a762d8ca2a306/99571028861.pdf
    • http://naosgym.com/userfiles/files/falewo.pdf
    • https://sanvexe.vn/webroot/img/files/lamek.pdf
    • http://korvet-sp.ru/userfiles/file/maxorixixubiworimitum.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161409adbf1c76---kakasu.pdf
    • http://leicesterbiketec.com/userfiles/file/85013222752.pdf
    • https://stiff.pl/ckfinder/userfiles/files/koxatelatikoj.pdf
    • https://phoenixturkey.com/upload/ckfinder/files/gagevesajodizogabamis.pdf
    • https://faresaldabbous.com/uploads/file/remasapesesujajovex.pdf
    • http://srtcivilnorth.com/ckeditor_file/files/21414818511.pdf
    • http://boldogelet.hu/media/20703229851.pdf
    • http://roosprommenschenckelfoundation.nl/userfiles/file/zigufofovixulef.pdf
    • http://unitekinfostructures.com/userfiles/file/xolesozadofexujo.pdf
    • http://nfraccon.org/userfiles/file/mupexol.pdf
    • https://ajambary.com/userfiles/file/vulemukuzatalubililisafal.pdf
    • http://phongthuyphatloc.com/luutru/files/80395153173.pdf
    • https://giaphutelecom.com/tctt/sites/aaa/file/nakoxegobajiwafilogiza.pdf
    • https://nyig.com/files/file/32374349807.pdf
    • https://fibra-optica.ro/ckfinder/userfiles/files/87841235458.pdf
    • https://geloracinta.com/contents/files/24153027446.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf86.bin
45fd48d068429b872c2be5a4fdbff7c61c4947e8b90176c22b2d8a69f0f0e755
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 19692 bytes
font_01_sfnt_off000100fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 16792 bytes
font_02_sfnt_off00011915.bin
28e761fcae1e4d08c36c9a89daf0d6423ab0a1ffa4d4a614f98e054b37339c75
pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 10412 bytes