Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45c722b102d9084…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 23:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eca836b1eb460da558aa4b1e9a207bfa SHA-1: c8fa7aac9cfb186708d67d246291fb740123ef1e SHA-256: a45c722b102d9084aef7ee357b77434cc0aaa12621092325d9abea215a761718
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The embedded JavaScript likely serves to redirect users to these malicious sites, potentially for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=gta+v+online+free+game PDF link annotation
    • http://www.vegagastro.pl/upload/file/34797220464.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/94315539497.pdfIn PDF document text
    • http://labsshop.com/d/files/zepafexerulogedir.pdfIn PDF document text
    • http://matras-devison.com/upload/file/5405935999.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210902211155.pdfIn PDF document text
    • http://anm-av.de/uploads/files/28483030130.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/65461213181.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/05113ac17a0f259eb98ec75e4bc44d7c/51296021590.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/libofobolu.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/26196444517.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/68455017043.pdfIn PDF document text
    • https://cargobull.cz/res/file/19779367892.pdfIn PDF document text
    • http://gensugroup.com/upload/files/beferorimewudixofugilu.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/zifitisasofon.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/gaxikidijamive.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8d414ba0---39757237204.pdfIn PDF document text
    • http://agro-partner.com/Image/files/15189470529.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/40509937914.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/83700640309.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210905040045.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/minitovodugisenid.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130200dd4e36---xolivuwevepamotadan.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/2737901287.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/kilorupab.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/18054181256.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/kevojirirulorasodibeji.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_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 10492 bytes
SHA-256: 48c337024e3eede0c6aec277588821eab2de062fb157d83505f81992d08e7255
font_01_sfnt_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 18128 bytes
SHA-256: 3e45fabb7306dfb148859293b882e3ebd8ff79669175437ced1b962e5fd41ef9

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