Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f73d790a13b126…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 23:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f06622ebcef8fc5f639c2ad468e7fff SHA-1: 6122e666047554a19891709c6c447207e438b3cc SHA-256: d9f73d790a13b126b600db7a055832637fce17e8df6a434eae8f307efc2f912b
164 Risk Score

Malware Insights

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

The sample is identified as a PDF with a high ML confidence score and a critical ClamAV detection for 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS upload directories or disposable hosting. The presence of a 'download button' lure further suggests a malicious workflow aimed at tricking users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://ombs.ru/uploads/files/jaboxokitudipegus.pdf In PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a13967a90---karisus.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/jijisenikaxomi.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/5296741635.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/bibege.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/gefukajovarel.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/lewitabotutawumorefiv.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/29898965257.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613184532d188---vefaxadato.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/85770830831.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/45047952766.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021919514437470.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/58d0f6498ccec897051b2b23193baafb/nedonesetoki.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/52381359591.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/49875311643.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/17900536145.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614559e7df1ce---99477995741.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/1663881671.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/17153554421.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/94055885859.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/17924448417.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/zepanopanaf.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/jumoxefuwuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=chal+mera+putt+2+movie+online+playPDF link annotation
    • 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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 17940 bytes
SHA-256: fe4aba5f1714d90b16a3aef4d3d83f70729d2f81f029401a58058e684f638a67
font_02_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 10780 bytes
SHA-256: 83d543c50a7ed63552d42be58c50e60c2e99495b8a7ea045aaa395ada22876a5

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