Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac5c546f654a783…

MALICIOUS

PDF

88.5 KB Created: 2021-06-28 09:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f6cdc9b8302f5a6c05d76c870e1ef7c SHA-1: 61e73352f528a75b63f47d6ee0d1e5d46ae982e1 SHA-256: 1ac5c546f654a783d30be98c87b9848638fd4dc5b7af72b80dbe0ccad352ae30
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. The primary purpose appears to be distributing further malicious content or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f33ab8dd8---xovafimajesowila.pdf
    • http://adance0112.com/upfile/editor/file/75930776129.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/sc14enl8uglcccen662b4cq8pu/24864312139.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30ce93cd25e3b25828f578afb178489e/21696001458.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/fibigirusovofujatekipetun.pdf
    • https://studiorampinelli.com/file/10295896890.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091355087834---29151905297.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae86df5a06a---luxozuz.pdf
    • http://anaminfo.com/attachfile/file/81737963579.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/54923480831374bb5218e1aad6a1dead/58406407085.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/e6403ebe77997671b82a488bcd47a061/26044407365.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ai8jq3k3f0et2cehmgs237ou97/36264506818.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1608b2c3d0968c9c8e466bcdd2ebbc21/78952832297.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7a01f22f9---natojojetina.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f678b8a374---tijil.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/98a8e9166b8d3cf4e40574aea7c3fc2b/35077710940.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62774b5711---91442036923.pdf
    • http://lucann.com/Upload/file/xolitakigenekonatobobefux.pdf
    • http://progfin.pl/userfiles/file/40209880584.pdf
    • http://goldnumber.info/userfiles/file/62004898570.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4667b3398ae702db002d6b09a0a6ba4d/loputofiduwogudevudeme.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ddaff9c2d722948ffc7ef8fbe2235ed2/60627701666.pdf
    • https://aartipalette.com/userfiles/file/nofedejasagej.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5f921f9fc---31613712541.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chest+x+ray+pa+and+lat
    • 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_off0000f7e5.bin
74204f8db5d00b514cb2dadb637a67f29c4a13302740865d07639f8131050634		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 10524 bytes
font_01_sfnt_off00010fdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 16792 bytes
font_02_sfnt_off000127f1.bin
b13ef4c424e7d30e356cf8fd65357c0a08f3b6d09b9aea814b0123e564a48c40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 17212 bytes

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