Malicious PDF — malware analysis report

Static analysis result for SHA-256 77af7a6265a22282…

MALICIOUS

PDF

84.8 KB Created: 2021-08-16 15:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dc074faa6696349cef4c426aef294f2 SHA-1: a4252271c7dd6872eaa17a8d4510517c2c51e9bf SHA-256: 77af7a6265a22282e9d20aff7d4e5b1d77b2630602e383d5c6a41d96a76302b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.dilipprabhavalkar.com/images/file/64041457762.pdf
    • http://houstontca.org/Content/uploads/files/47129214949.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/33301339966.pdf
    • https://irantruck.ir/data/file/55931005250.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffaaa4f656---luluzepabe.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c3e0f237d---68559657725.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941d8752ffa---fukupojot.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8cbb01aeb0a1d23780308e6b356edb05/kuwazexurakutakodivedej.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1b08ca88c4ffcebfeb6acc2c9b83e097/4235368998.pdf
    • http://7166867.ru/ckfinder/userfiles/files/16125083869.pdf
    • http://heizler.hu/files/file/gibonuwixadevutiwami.pdf
    • https://grandplaza.bg/uploads/assets/file/55239854896.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd342356f73---pavedofekebu.pdf
    • http://biosurfest.com/userfiles/files/serunonanepuxesino.pdf
    • https://secolink.sk/userfiles/file/95230188489.pdf
    • http://hbleg.com/admin/userfiles/files/19161085032.pdf
    • https://duocvinhkim.com/userfiles/file/46571433376.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7394663598---kofiwotu.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/84634953159.pdf
    • http://zonweringnederland.com/ckfinder/userfiles/files/34763955604.pdf
    • http://jsushibrea.com/uploads/files/45893129715.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2f8f608d7d15ef64897767a9a6b0e576/34155856926.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=clash+of+clans+mod+apk+download+unlimited+everything+latest+version
    • 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_off0000e451.bin
49d29ece02bb9da4930bfd6d000353c767bf4b37795b7e54c7dfe837a3c202ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 16884 bytes
font_01_sfnt_off0001104f.bin
7e9d8b60fff3e2739cceb913cdb7d146f69aaa8376bc2db8f5f3ddff110605e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 11556 bytes
font_02_sfnt_off00012b6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6E 16792 bytes