Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ba6765645c7a11…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 10:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0babd0fca9ed57504e6899b7b872975 SHA-1: 3e5bb4cac901d77f1f280e6a2b819c5d178ce258 SHA-256: f5ba6765645c7a11e18a2ab022208885e97c57831aebcc524a0991d9183d0f4e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lure users to malicious sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=mixing+octane+gas PDF link annotation
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zivebipowitusikidisudoger.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160948aaf0ec9f---20047338247.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2h99s42b6bjeajh44501te08g6/butigenutofavomezovob.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/494erhs4smgevdng8l1g05j0bp/51983848374.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cedadc86d---39690102651.pdfIn PDF document text
    • http://kustari.net/userfiles/file/56334379538.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/59763539268.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6hn5bqqcc2v3vpthrtidckqh47/waluzoxijenijosevijokamum.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/47306507259.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607043c2d888f---nodeselaxetozewu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/bcfc34dff834d376816edc5968f34f48/67337155906.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/binebozawukirebu.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754fa480619---litewi.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/fixugojataweti.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/zofujem.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/d8374586d1eaa3ab959312dce6af095b/20068741166.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/aaad390ddbb3409476b192152ebb28ce/67964581359.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/defabazudadukorovumipopi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607677b80304d---73861686922.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/42354667203.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/sibujifewumebi.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4a22e4ae1937c7afb3a133cc7843c4ab/40974352737.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/vixananakubabodipere.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/78599519396.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/birape.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_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 10352 bytes
SHA-256: 60615a567e2ea1ae919141d007b69e9a57185380002d9bb8c25e000348b1c9f0
font_01_sfnt_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 18316 bytes
SHA-256: 061d4d8bbb80ecfdaf828bff3c6cd269441e32b17ac950770195601673cb290d
font_02_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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