Malicious PDF — malware analysis report

Static analysis result for SHA-256 c387b9142d3a64ec…

MALICIOUS

PDF

89.6 KB Created: 2021-07-08 13:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: faa45cb22bab1497b0200b8b8f3d1303 SHA-1: d5cf88d8c9a4692d80e8246b96914758118d1530 SHA-256: c387b9142d3a64ec1910580cb214550626801039c58df8e68e5bda9703ad6815
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cructi.ru/uplcv?utm_term=dilbar+song+download+naa+songs PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfda153174---zinebi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bb7a137e---sofovisuk.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lh2orlb21pu9elqffld3j9fju2/zupolejo.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/kurodumebusakezutajex.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/sibosuk.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e0c26e95333a4de0530c5d45b8f36ed/58974098408.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/i5pal1gkqd2istdb7eudd39pto/17361126495.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/r7ap0afjhboeet8kbm7fvc4351/vefusafaxolizeme.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c421451a8a9---lazodogozolitetesimeto.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/dizuzorajasuzafefuv.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080afa888228---dupuxutopazuzezedizewu.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/puronifotosikoxapevoru.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/63707341298.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/rilanunologi.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/93fb2d790c91d32ebc73d05b07b8196f/83113096938.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/85727307455.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/79908460709.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/o2cc71g5mhrlklhdsrbkgn54qc/1673240222.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/riwazafuvad.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/06bd852f23ee45e054f74e5b44e40181/69050163368.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/nibig.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_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 17664 bytes
SHA-256: 348afbf50c281e464ce6b76c1876d00a2b9cfb86586b6aa26b551082162a8d16
font_01_sfnt_off000129d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D9 10420 bytes
SHA-256: be00ca181a0814efd0e3f060a447ab7514fb827cf5b6a92893aa52632919ffb5
font_02_sfnt_off00014157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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