Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6b2e90b6884711…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 18:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e5ad8572dd3626f6f8e11e5ff4bdc0c SHA-1: 0c320e116968f367c2937d02a03740074576a13e SHA-256: cd6b2e90b688471199207b29cb52e2755f5b46df852b2f2e6135bc9be1000237
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=english+russian+dictionary+pdf+free+download PDF link annotation
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf78f6fc0e---nivok.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/rimijakopi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3e078bc0---71342547366.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/zobon.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/69260275961.pdfIn PDF document text
    • https://scalper.ir/data/files/file/vebanu.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/bofujisodixo.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/13526249979.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607079c5421c3---totokosimuketonopupoz.pdfIn PDF document text
    • http://cichanski.com/Upload/file/gapenezupekaz.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3f6504e5de74e4fd9175664476088037/fafefokonupuxanatel.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/62408392847.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/rekolijobesodezen.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/53136230463.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/408dd0b2efe585fa7334fbcc476ad700/1316959270.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/selafu.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/13850902606.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d662acf9e4c4f12d4280c0e84a34ce2e/79208271843.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/38649688143.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lolebabekamutasarakafid.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc39e820764---7066189840.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/46058572296.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_off0000b7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A4 11180 bytes
SHA-256: fa760dab1e63d28894bd6e1b5f53b9ba2fdb68e01bff8ae4935b82c39df2e0b2
font_01_sfnt_off0000d1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 16224 bytes
SHA-256: 8e29fcffa0773035e863a6f9de2b791077267f47fdb6476d5f6d3d4dbd02cadf

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