Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4242c904f9a5078…

MALICIOUS

PDF

77.7 KB Created: 2021-09-13 05:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d55e62562179ca599a0a10946c22b11 SHA-1: 01309df014d34d2732f7efc715f85f1cbdd854e1 SHA-256: d4242c904f9a50781ad810eae26aadeadcf000335b039c0c7977319a6b13305e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7e90ee9ca9878893afab655186c33f79/xutapumunivadizejuxeru.pdf In PDF document text
    • http://pataibicaj.hu/userfiles/file/37020054920.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/43377306147.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/84639965540.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/doposejubaxemojemored.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/37017502166.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/46716581121.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/98144267323.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fea6baf82---lavabemuputim.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/31919627596.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/gezotibagolibup.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/segofozoxetulikot.pdfIn PDF document text
    • https://unosms.us/userfiles/file/bujopogu.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/34479037263.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vemifukaba.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/wowiru.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/jeletokogerovesap.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/ritegizuxijesun.pdfIn PDF document text
    • https://mattress-leader.com/media/geludotikekipovoxogupaxuw.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/78295cf03c0214b2766a0a12f438965b/nenijasenomerid.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/kugoxopexixinavutitokataz.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fa18a1af6b2e5eff0fb9e42ee3e9f14d/85428790255.pdfIn PDF document text
    • http://kunbot.com/upload/files/vonov.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/sagimemagigotegek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=power+vpn+pro+downloadPDF 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_off0000c9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C1 10180 bytes
SHA-256: 69a1e22eabd5cb92c1b820649ea86912fcb6b8d5dcac0ebb2e3b6de571eb5b06
font_01_sfnt_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 18324 bytes
SHA-256: cf04e2d873371ac9810100b00fec03ff1cc71f2ed087a9543a1d510be7495489
font_02_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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