Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c1a79145564f13…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 22:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25628791e8a58b1f0b33854872f85791 SHA-1: 683f4dd9e5187409c0cd604126feeebd77cecdad SHA-256: f6c1a79145564f1337150008758279ce887d29e4d5c14419c47f834360ec51a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It impersonates Facebook to lure users into clicking a link, which is identified as a credential phishing attempt. The embedded URLs and the document structure suggest it's designed to redirect users to malicious sites for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://huntic.ru/uplcv?utm_term=how+to+hide+apps+on+zte.
  • 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://huntic.ru/uplcv?utm_term=how+to+hide+apps+on+zte PDF link annotation
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/teselovuxenepidirire.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/672194447.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/josod.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/88591376266.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/14417035253.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1514c07a8---29624028662.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/geruzibibozowo.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/28272576393.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/jezenixeveripurobosas.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/kopirikopavavadosejilis.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/95658858511.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/towilutekik.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/830b0d716cb450c434a93680e4e20e4f/68296884079.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/42283562088.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/fegefenobix.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/8880204311.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/aa7bafa5be4b8f4ee745d31f5cf7e486/mudafaveriku.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/vaxur.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145dc60e5e25---9653016715.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/80188820398.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/27121909829.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_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 10480 bytes
SHA-256: 72e1ec8715e0531db036fbab5d0c9aa2fc7d74cdbe76e3b387129027cf873ec0
font_02_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 18052 bytes
SHA-256: e30b6e76063edbce10fd970d3119dec7a340e8cd2e63432af47b6ad6fa26ec7c

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