Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd7d9419985a20f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 19:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74223461c604622408a085bed7c50879 SHA-1: 539bf570828a251a5aa90642d0ca3106b6b4b81a SHA-256: edd7d9419985a20fdb8889922ced1a3dccfc563f8defbb98b769038d11a4042e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs that point to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the primary attack vector appears to be directing users to external malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kiptep.ru/file/kofusabuborikarog.pdf
    • https://ceccarbotosani.ro/userfiles/file/lomiradisebafo.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613076df9f035---80599953097.pdf
    • https://istocdukkan.com/userfiles/files/78216411130.pdf
    • http://kingsfci.com/userfiles/file/21184977381.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8921c512c53902f31b8366e57c03cfef/mosiji.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/dilawalakodumeluxinewabek.pdf
    • http://pc580.cn/upload_fck/file/2021-9-13/20210913001919261708.pdf
    • http://yuli-china.ru/d/files/5721516772.pdf
    • http://ecohort.com/userfiles/files/20893282475.pdf
    • http://belv.ru/userfiles/file/1545319746.pdf
    • https://okazdedziecko.pl/_files/Media/file/75401557935.pdf
    • https://cplastik.com/data/cms/file/39534314074.pdf
    • https://abcoegypt.com/userfiles/files/menaxumojarefebiw.pdf
    • https://soechi.com/userfiles/file/57775429866.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/984592b489d89ed4f8cf1f3d35e6bf40/baputonuta.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=can+you+clear+app+data+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 16792 bytes
font_01_sfnt_off0000eee2.bin
ebec4e7400dcc3789d0520e10498bbbbe14199d4082800c73f095727bb11a164		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 17084 bytes
font_02_sfnt_off00011b13.bin
07afe565dc2466c2cecf391134b626e67e065c530046803212298ed2e6e1cb64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 10584 bytes

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