Malicious PDF — malware analysis report

Static analysis result for SHA-256 5542da92fb0c1741…

MALICIOUS

PDF

89.1 KB Created: 2021-08-02 19:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6490fe07ffa7e90341104dac78aa1f1 SHA-1: 795da9d7d40359d723ac533d775dac53ba0658d1 SHA-256: 5542da92fb0c1741cef58f9ad761e76daac4d7bbbb91d64e5caa8e5048016f02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The file's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/342ec5508fecc5fa72a477e3fef8da05/10327240906.pdf
    • http://immobiliareborghi.com/userfiles/files/witidududinil.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608974a69b729---67874963802.pdf
    • http://travelport.pl/userfiles//file/79110942601.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/63e58004e0c6aa1a62c920e0dcd9227e/52275854685.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/birug.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c049d2e07d7---favoji.pdf
    • http://animationcoach.com/userfiles/file/xavuwetunagemixa.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/nojegefelakibavimesarinep.pdf
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/85906465642.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b80b06f82---fonov.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a215bb2564d---20247076997.pdf
    • http://santeh.md/img/files/48771079189.pdf
    • https://dietacud.eu/upload/file/10616544981.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb62b4e5c47---34138394889.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/bmc98bs75u6ch6ahlp1st3e3g9/95995179716.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/88622539643.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/44448708010.pdf
    • http://aeronautike.com/userfiles/file/vifikipixolizumekasefati.pdf
    • http://grupophi.es/uploads/files/40643089267.pdf
    • http://kojeneckezbozi.eu/userfiles/file/14111194470.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099de065c742---30894786656.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077837be20ae---volikazoz.pdf
    • http://1qjd.com/upload/files/2021-07-17-12-38-23-Hg7tigQP.pdf
    • http://aceonlinementors.com/userfiles/file/pikodeliviwodozinisoter.pdf
    • http://jakpaisanestate.com/images/upload/files/53143153492.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ptv+sports+live+match+2021+pakistan+vs+zimbabwe
    • 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_off0000f4db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 16792 bytes
font_01_sfnt_off00010cf2.bin
bb70cb0f2a5243505c40ed24c04652de1052450b269028555f6b1cb68530d1ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF2 11380 bytes
font_02_sfnt_off0001278e.bin
e6ecc045b45f0a0a61be0277e540e3ca4d485420fc7121026aa6ba3e4bea2360
pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 17052 bytes