Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde3b4f9581e1894…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 05:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 443ed069d5392a8beb5f0671bac79114 SHA-1: 10cb0151adcf08cb02813ac7d59d3951020bd68b SHA-256: cde3b4f9581e18942b572a68925a75ffd9a16703c93b20ab849144fdb6344cd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of 'pdf converter apk full version' in a URL indicates a lure to download potentially malicious software. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/wibogonidojobenobonibet.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bdf3196b8---zorexegiwiwo.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23e550c658---94394182905.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e1a214caf7f2ab9c01f1515c81e812b3/36461498354.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/49179451687.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/lazixonakepififusudoxewi.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/68146432752.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/12102265485.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/sunugerumad.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e954be9d1---fuledafoza.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/48109151127.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/nakavexazo.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5280c693ac045b5bf811a45a4491b7a3/47043774940.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/40426866657.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/suvugefebumaj.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f4b515c33---87579959119.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/42812820999.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/vamiwudewuninaz.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210714_144858.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0313f392f050308d33df653e4c66bd9a/tedubefop.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b836dd8fe94---62667034738.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/kekininexabejabubak.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/96385796338.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/41625369840.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/58953326216.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e0e598f5---xapuzavutaruxisugor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+converter+apk+full+versionPDF 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_off0000cfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 10872 bytes
SHA-256: 24318bcfa7401afec7f4cd386c0f20896a4dffe28349ac7799cb5c886b70439f
font_02_sfnt_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 16620 bytes
SHA-256: 8529baad42b05f91313798cb3a862415769d6568a49649bf4b254e8a69ba5c55

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