Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d64339216153c3a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 17:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e47e3daeb3ebeff145fe9090d3a07495 SHA-1: fd0e141c0c2d20e59630eb9cec9e4a87a21e6369 SHA-256: 8d64339216153c3aa7f60cc66cee731f339d8de204a115629410174324da199c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to manipulate search engine results or distribute malicious content through a network of disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://entrackintl.com/uploads/45623749712.pdf In PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/raraxe.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/dedudanebidutasowesibadu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e1f157d6330b5535e414a8c4da8383f7/nebedalitixirimoz.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/92359009559.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ag2aoru79ae798eh5hinrq6gh1/60511033097.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062916513712.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2f8bc7ba3447b28b08d5ba81c8524dcd/fugus.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97677690794.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b130aa055b1---96841080355.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/luviwojeximula.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/sudipuzigeti.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16125be073d7b3---golafelifutapowasu.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e614940e234ae55ba2d7b9aa99312117/84315100102.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/mimefonit.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/xepojekos.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e23f40599ad---86440267137.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/32763343147.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v16qdvdp0luntsejrj4ffto5g0/zesirekixix.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a712417e39e---rimudefetamafumus.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-27/20210627150638293419.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/9303861713.pdfIn PDF document text
    • http://goref.ru/files/file/wutawiralub.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b5e1ae434---sixefusum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=types+of+plants+worksheet+grade+3PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC249 17376 bytes
SHA-256: 65186badba0f56dcddee162077fbb522eee526a5f442504350bc44427fe951f5
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 16644 bytes
SHA-256: c54d70adb07e023924bf5d1abf5e066a771bb0b20cf07c22610d6218fb4b7f59
font_02_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4A 11112 bytes
SHA-256: b44fc75251e88d47c908909c8ba85dfc8a2ec73e9c34105b6c64a6f559b4c745

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