Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c65ddf35e71dcd3…

MALICIOUS

PDF

90.1 KB Created: 2021-07-13 18:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d2794056c9c2213c79be8066719f0e58 SHA-1: 656ccbc5c1d0504f04173b8ce5b95b736cc8dee2 SHA-256: 8c65ddf35e71dcd3e2cd198e3cbc89e3db7c1d9e156a5c1397e0626c59edbeeb
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites, specifically WordPress upload directories, indicating a likely phishing or malware distribution attempt. The PDF's structure and embedded links suggest it's part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27999d453---xazepafadesuketebolit.pdf In PDF document text
    • http://ansing.nl/userfiles/file/26594573476.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/da06c319ecdb1b61ac8eaa921d4e2258/73366190781.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/45051913730.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afb2188c3ae---56735310750.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/59930885577.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/berupowizepugekidox.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfc9f5bf93---5578625508.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/mezigitaxe.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/75485041552.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9a459387ba0e21f0a85b590e83222aa3/kazerabowewajunejorugena.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/79809974320.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16073ecf96ad38---lojuxuxukolenuduxefuwo.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/17c9b1a42282832e97a73c6c5e85e013/55032390395.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/bevukotowabifufulim.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/siwilozexesezetagukovu.pdfIn PDF document text
    • http://wamer.org/userfiles/file/mezuzusatezo.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/rexagulidesomamoz.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/krgje2a1jjl6dbk04csen0a0u7/sokanubep.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/kizib.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23591157aa---noxopulu.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/98956530096.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/61122512458.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/015839d736926a24981b03c6d08d8a05/52212558880.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b076fa0ca52---42117562337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=marcia+quotes+from+the+outsidersPDF 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_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 10828 bytes
SHA-256: bdfd429eb30dd9b495a2a31b427749a2532152b009789ca7ef1128516d3ba9ab
font_01_sfnt_off00011471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 17872 bytes
SHA-256: 196bd81b096d398b7a691e1263b744d251935c3cd3f1daafc5e6fa9ae6bc22a4

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