Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7681ab1f253fe56…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 22:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e3b355b345ba5a393ee21175a06c806 SHA-1: f7286fce91f51c75af1de8f69bc5d420183c501e SHA-256: e7681ab1f253fe56f6bb3f5a383d06b5bbf2db0ec0beab613c070fec2c4c3ca5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious files. The presence of a 'download' button lure further supports a phishing or social engineering attack. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=eden+world+builder+apk PDF link annotation
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/11f0e89e3a5e606227e00f9526e4f5cb/sobot.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/solisimuri.pdfIn PDF document text
    • http://contextuae.com/resimler/files/26777918362.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/27273172754.pdfIn PDF document text
    • https://betsin.org/userfiles/files/75665247123.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/892032472.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/wabesafes.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/66753668406.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fc2428a6a.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/13594614609.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/62721554097.pdfIn PDF document text
    • https://nexapos.com/upload/files/refagopotenibedilereb.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/9109093892.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/kixajumibevekuje.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/gexudimujejepuvasup.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/gapewofefu.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/jeriwadefikokoxexafanivej.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b695e7d98---43113795951.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/39404769351.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59ad95cd7---fezababunodolalodijomat.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/25235709888.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210910094826.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/soletomutomozozawenuw.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/38249678349.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_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 18800 bytes
SHA-256: 4ecb74c7ae586a2c9e8a70c679c63eb64594c395c6c035d8c81f6490af46b3f6
font_02_sfnt_off0001246a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 10520 bytes
SHA-256: a186ba835810b37427778c7c5f5bdccf594255b287d5b5bed621bd2e4edb17dc

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