Malicious PDF — malware analysis report

Static analysis result for SHA-256 98576d72ba7b3530…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 01:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 411aca05bd2a0ea09db7e539f0e6e36d SHA-1: 291044a86a7da9a3aea59b8dcafd58ca98462e6a SHA-256: 98576d72ba7b3530702bb510712a3804b9fe21b1ef62fe8bcf0d34de8be3ad33
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly flagged it as malicious. The presence of multiple external URIs and link farm heuristics confirms the malicious intent to leverage these compromised sites for further distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e7f3cd319426178d3e76a25c7d4d11c0/20929019112.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/16be6dd786ed373f079ad0c3f5a89dd6/44070534411.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/kuzuludijowolifox.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d526d6f67---fagosiwudakegimu.pdf
    • https://aep-tc.com/cache/fck_files/file/kifojururojesavawunumim.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/bp8o63i9inb3rst9jqd3v6tfci/gezemekurab.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/slph1nc9ok0bhfc3vq27pfaaf0/sutowizifutamukekasamun.pdf
    • http://poorclarescork.ie/images/juzigexazezanumogex.pdf
    • http://caudafotografia.com/userfiles/files/39205388318.pdf
    • http://utuin.net/files/fckeditor/file/78694888530.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/zozelazapazedilitepituki.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/29aaf2d54a6ad90c79d3b62be3e7425e/xaxavuwajowote.pdf
    • http://thecrayfamily.com/clients/36408/File/63892815857.pdf
    • http://siamsnail.com/media/userfiles/files/semelofefigasaperej.pdf
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/59333898597.pdf
    • http://geose.ru/userfiles/file/27779416710.pdf
    • http://ristoranteyuri2.com/userfiles/file/vuxolokitogirazuj.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5956e9bea4c147c391161cb475dffcb5/sigifuzediwe.pdf
    • http://arohitourandtravels.com/userfiles/file/57757401191.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/t8quio4gkn2fj496ccdp27kino/59864508129.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16076c480dfc98---sudovupofevif.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6ab9eadda9d0e860854382d30cdb586b/riboxajoto.pdf
    • http://demirlermetal.com/resimler/files/7977813464.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bright+starts+baby+bouncer+manual
    • 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_off0000c3d2.bin
7e88f50bb7442c075b44dffbdc4fd07572b36adc6ea3762fe5ceee1f237a6f59
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D2 11084 bytes
font_01_sfnt_off0000dd8b.bin
2403c46c8dc1b28221a2c98fcc903adc44fae9e0762fc47a91efe6e69a89d437
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 17780 bytes
font_02_sfnt_off00010b8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 16792 bytes