Malicious PDF — malware analysis report

Static analysis result for SHA-256 3914aaae875a3a1b…

MALICIOUS

PDF

88.5 KB Created: 2021-06-30 03:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ab7c89ddcff11b88471fae5471a15ff SHA-1: aa11cceb3beb5c059bf4963ef6ee8e5f8c7da6d3 SHA-256: 3914aaae875a3a1b2bab5cf051ef9f9868f48938672a9debebd50e6174e5145f
164 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of external links, many pointing to compromised WordPress sites, and includes a visual 'download' button lure. The document's structure suggests it functions as a link farm designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://31kouqiang.com/userfiles/file/1623596233.pdf
    • http://nensi.si/upload/file/dotozebinupeke.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f12f3ed891---71555245966.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/9345b5ed14dc49a2a8c7afb817d3902f/89063065297.pdf
    • http://ipceurope.eu/assets/file/visuwefodamopek.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06fc1bab30---bofugiw.pdf
    • http://bortran.com/upload/image/file/20210612121947.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d063306a63f---24121795399.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/s2jbfk9d3b5ildpb57je5aj5aq/tigedixew.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d474fd70956---wodesemubaworilagu.pdf
    • http://kennycojewelry.com/userfiles/files/202106/1623097020.pdf
    • https://dollarplus98.com/images/upload/files/wubosuzotiwexulozez.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ab369b0c5248ff35535c243123260966/nafavetanuvawalasired.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/t9ldo94fa9k88dt0dl12du15o6/wagatonozizo.pdf
    • http://animationcoach.com/userfiles/file/35390463758.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b05f531bc---33424333723.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b862d0e0b42741b271ae737f402bb91b/faxekeparix.pdf
    • http://timandlor.com/userfiles/file/95006864974.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d688847e8c7---dafefago.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3c9fbd007---12965476333.pdf
    • http://alnadaoil.com/userfiles/file/fidixaraxitegebalixob.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/vhb8duqma1froet9arpqnc3g4d/94399782368.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077353930c11---xoposoxuza.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/74564087469.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/65920667808.pdf
    • http://colescastle.com/clients/875019/File/ravedoxijubag.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d18c29e178---sibaxu.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc32c5acd---nagabitelegora.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=political+science+ba+1st+year+notes
    • 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_off0000f5d0.bin
b1e4de1b680197a8dfe4d669cb32a50b4b8e954181f0798f5eb553c66657c302		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 17724 bytes
font_01_sfnt_off0001240b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 16792 bytes
font_02_sfnt_off00013c22.bin
aabf8734b6e3204f32fe6e014aa191cc673f8361992594b7832910f73c1f760c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C22 10532 bytes

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