Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8652a262186da19…

MALICIOUS

PDF

95.3 KB Created: 2021-07-31 21:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad17928965b09dfc53c3a028b85972aa SHA-1: da4a15249c355815cdf346ea583164eaa2cb9848 SHA-256: b8652a262186da1904e8a2386c5b3bb1f4c7fcbcf57f4563a333807f03e0282d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple potentially compromised WordPress upload storage locations and other disposable hosting sites. The primary goal appears to be luring victims to these external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://angelojrobles.com/admin_initial_test/userfiles/file/sugubavesemuxatojajori.pdf
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/baxujana.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/20214282795.pdf
    • http://www.propper-droppers.nl/files/file/47745488244.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30a62ca091---16801826117.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7c35b7e445f2d3ddbfd0a91ce40e7878/betizedelix.pdf
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/muginewedire.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085af17bd50b---larivonisabejikapojima.pdf
    • https://oncallanatomist.com/ckfinder/userfiles/files/94773503539.pdf
    • http://hytechplus.com/userfiles/file/xusukapuz.pdf
    • http://ingatlantv.tv/userfiles/files/wakagogenonem.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b31c6bad7ff---99188453714.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/617f362f046066bbd3e8e888d78adb51/magidejasefolune.pdf
    • https://aulacvn.com/upload/fck/file/bazusuxotamopal.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/lafurudosulasija.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e7a7e1f31---88287756577.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2c478075---90899608648.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/47dc5081e9c752ec7cd43e8516494a00/99628209369.pdf
    • http://asesorgubernamental.com/images/file/59435045885.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16088b5c7a384c---69411901919.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14b3f97397---78483347280.pdf
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/sipefevebekadovezuveku.pdf
    • http://rainesclassof1980.com/clients/3/31/314d3ac3c31ee16cfc8f78d457af0ebc/File/futib.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/199419e72ee96d0b330a86c176744ee2/48090993322.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=c%C3%B3mo+se+hace+una+mezcla+heterog%C3%A9nea
    • 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_off00010c3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 16792 bytes
font_01_sfnt_off00012451.bin
ffd26714a8724c66f039a0d6422b8cb82a290a3c895ae383e4f3b68ad38c87b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 11068 bytes
font_02_sfnt_off00013d74.bin
9d30fbe92c4dc1124064d41ccebdba1aff9f4fbf0c7c3d06e9d74662a1528fcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D74 18244 bytes