Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f1d00a854206f8…

MALICIOUS

PDF

89.1 KB Created: 2021-06-26 05:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ffaa4c5cee247efc45993ff58f6e138 SHA-1: 65e4af1a53ad4825f110f6637150a7dc23fbbf79 SHA-256: b3f1d00a854206f84e7325ff49dd2c737d9ba69b0cf23b161a0d231f1b359565
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure victims to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=every+kid+in+a+park+2021
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8e8b54d01b9531b7412bb5de5d4dff9d/ralikizodiduzugegovera.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/miselagozafezujaditibul.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/cpspk186rii0ho0iff2t4stjg7/75502251774.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/82c43e73a6b17580bb0bcbc99f245e09/87038206528.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/26c37f1843348cab7bf61acc1cd725d0/48392044914.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a782c82c96174c058fdcdc0c07d819c6/24005838326.pdf
    • https://qnzar.com/files/48490704514.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e3a2b75ae---seduputejit.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5aa79b062e---7682899433.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b82c966a41c93194ae448f038b49ba7d/49142218402.pdf
    • https://getadoc.in/ckfinder/userfiles/files/91508645945.pdf
    • https://allcreaturesinc.com/files/files/60919507701.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00125f674---5560912871.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3488be300e---55012859050.pdf
    • https://radmangroup-ye.com/rgfiles/file/roragotabofakuwakosijat.pdf
    • http://learningkey.org/userfiles/denunaxo.pdf
    • http://industrialdevices.in/uploads/89955648591.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081933272783---tesaku.pdf
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/badubomubuzukifumuj.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160960a50923f4---fupopexemololufujinuvima.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dedabebeb---tilunupebabuvirate.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0ea0d18d---timixuzebagagabanufa.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ab188ebdffe---4506539258.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6a6b0623a781184de02587d10b2bcc1d/sonuxi.pdf
    • 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_off0000f6f2.bin
21b9d94a1303197aafd355eec1931befe8d230b8dde7a9061dba020300813d9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 10504 bytes
font_01_sfnt_off00010efd.bin
d506b1b6ce7b9cff74b8b31824b0f24bb7e011d085d45c63c6a7e6459ca69395
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFD 17720 bytes
font_02_sfnt_off00013da3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA3 16792 bytes