Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cff9a1e72a72d8…

MALICIOUS

PDF

100.5 KB Created: 2021-07-04 18:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c6c90e137f50db1e483b599ee0c22811 SHA-1: 3a3cb6993ddc1b2a2e207b7dd4f79d5703f96bab SHA-256: e0cff9a1e72a72d826e745b2a2c0ced274533d4f969f0ce51a67b1c349e42adc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users to malicious content or further exploits. ClamAV detection and ML classification strongly indicate malicious intent. The document's structure and embedded URLs suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e80a64915098d59abe55d8abefcb76a7/89213545844.pdf In PDF document text
    • http://www.samlab.com.tr/wp-content/plugins/super-forms/uploads/php/files/bfrg4uni230umdk2p4u48cvmft/lomadaxixususu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/20e1ddbcecf80852da4da6a122a17ddf/20549137055.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/da101bc3c06447a506a53846772a9fc0/54754994004.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hf9651ovh70t2dkmju48gdn6ok/44674373909.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/p188vato8j43rb2nfnnf6t9aet/jozamilefivekegip.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/kisakewapejubad.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54d2d2d64---jaxokaw.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0223ed4ac---55208729740.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a0dad404---buvikugezosupejugorerum.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/85891721696.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/r38vfd725d9jkgci81npu30603/98929404879.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/45609030878.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruledezu.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/28574841589.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa296734f---93190644246.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b9aaba8e---1052688438.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/96877457080.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/bff17816762dcb1e2e7add40c189976a/xaxanenonozotukuwako.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/sevedosezejelige.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/07jgu9n4i3hcekf1moj3i2csa6/16866648177.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/rimosajenad.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b2a4ec556---44382633682.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/5ddb903ffa4b1b2f50a83c3070607f54/51513993915.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kapuwijikugo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4025baae---jatavujakubos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=circulation+of+blood+from+the+heart+to+the+rest+of+the+body+is+calledPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A0 11128 bytes
SHA-256: 144fccccad610debb58a4b0670ac6769ff96dbb6c4a330c8edfb36b05f99c50e
font_01_sfnt_off00013f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001578b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1578B 16812 bytes
SHA-256: 5ffe87205b9fd8c4610ea7b1db3972053a0861c1097990d07d2bfdc508cc741a