Malicious PDF — malware analysis report

Static analysis result for SHA-256 76175df26483b492…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 08:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bc50f58aad772585b28ee9c5025473e5 SHA-1: 5afe7cc1f14370109d3009a5519422eac1d6e2ab SHA-256: 76175df26483b4921be62b2ba2a346984b761df84f1465b281c84a459448fa75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, suggesting its purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to lure users to compromised or disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://pistant.ru/uplcv?utm_term=indian+polity+book+pdf+in+bengali PDF link annotation
    • http://transfertrolley.cn/d/files/sivelomenazukeme.pdfIn PDF document text
    • http://tcihk.com/userfiles/xukodex.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/edaab1ac9020d5c5b180178e6bbb0910/66754645833.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/84061640694.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6bfff1f18---72624639456.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/nml13862vhbfjtobtat5uo2lak/80296568685.pdfIn PDF document text
    • https://gangnampools.com/contents//files/75818577210.pdfIn PDF document text
    • http://pneusmarene.it/images/file/rebupiduxiliw.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/zumipepakes.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/64279844942.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/119aa414248053ce89424edc0c7fdd9c/65826404782.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610db7788ab2d---5703478003.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129fa326534b---gilexunopoxuxonujojipedu.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/9s8vrcivghhhkqlbjjv4aomq87/84889193124.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612daac855487---97745093850.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/209fb584f65599d5e02628755789cb84/tesapaxepenidori.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/pemewowufota.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210604060447-39951597760.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/8408248647.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1343f7b401103de5189884b3fc18e340/31201926097.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/94864939746.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/5c283ddbca393916ecd91a6434b99efc/feviwubadokaxu.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210801/16277719484979.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB305 18972 bytes
SHA-256: 215af311063172a429482e1fb04ec587260749bebdd80dbb852073aa88cd5f32
font_01_sfnt_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000111ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FF 10700 bytes
SHA-256: 5d43c105af854f06d569a13ef3f7b166c6608ecfda40d87c248cea0e945e0ed9

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