Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d05d9781a4054bc…

MALICIOUS

PDF

71.1 KB Created: 2021-10-03 14:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: daef40fbc9856953053c7c8e0a87208b SHA-1: a2b224d77990e4146854a1528c91855c21ba6a48 SHA-256: 6d05d9781a4054bc958c132ff8e9f246c3502fcab9a0dc7be3a91b47c1739feb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a lure for phishing or malware delivery. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=the+song+is+you+real+book PDF link annotation
    • http://bowie.abwingsmd.com/uploads/files/61475416693.pdfIn PDF document text
    • http://tion.hu/upload/file/xefedejaxawamig.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/rulupi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614429c664f96---nepefugolot.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/gapikufugofatejuwizo.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/xifapezobubobetalal.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/wadurewuduwe.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/xowupa.pdfIn PDF document text
    • https://dm288.rs/slicice/file/zenakewigaveduwi.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/salibenis.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3cecaf6a7e02f7c1eaf479b0c7ed5fde/newivuge.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/88322346065.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/robububijilelokuponilu.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/15062334680.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/82370169756.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/57690317404.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/nomexedo.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/posalug.pdfIn PDF document text
    • http://iphysiology.ru/upload/babiwopibegogikifulufe.pdfIn PDF document text
    • http://protezas.lt/i/File/11464564526.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/67507743643.pdfIn PDF document text
    • http://www.cabinet-pollet-lille.fr/img/uploaded/file/wewazobelonidemadupolukos.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/3507305330.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161597020447fa---83974227130.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/valeromoxexu.pdfIn PDF document text
    • 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_off0000b412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB412 16296 bytes
SHA-256: 210627d36cc4b421956b9e36e541df9772dab9cc6f0836f6b38ea7fac25aeec9
font_01_sfnt_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 10696 bytes
SHA-256: 2af1e6717d895f2c4b5ebd2b7625ffc1f73bc0d02a154edaca7a66d1b96bbb5e
font_02_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1