Malicious PDF — malware analysis report

Static analysis result for SHA-256 08de2586e342bee9…

MALICIOUS

PDF

88.1 KB Created: 2021-06-29 02:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 04453a0a0ba7101b91462a6fe5a224eb SHA-1: 01557bbf15828c33bca36142457e24626e2362f0 SHA-256: 08de2586e342bee94ae406065172db18681c7dd3c63b12507a966ae5b17768d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The presence of numerous external links, many pointing to compromised CMS upload directories, suggests an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=introduction+to+computer+pdf+book PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943cfc69031---30174396034.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/051012c6d0980c29060d187af80de9d7/ruzegifidiwuxudokezorafuf.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/jorivonulo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c959163d57---18050521450.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c8a63b722654cac47400661f67f1a8a3/saxipumopobibojagodabeguf.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b611f562510---walevupagolalivep.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vhu9vp44asqnfm2lkuv4fgtcu1/32559020020.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59f7797ef4b244d952dba197f67f4f19/vadogoxi.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/8317020463.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/80707360845.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/silejig.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/39958041054.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/34235032967.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091063e622b8---timupazomilusalu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc016e4670---82901164040.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/fogobufomakoxixejijonum.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/14112055409.pdfIn PDF document text
    • https://laser123.com/geektic/files/95110503867.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/95638062685.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4ffe345a3---15868440596.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3ff5c8e3f---2708198306.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/vanolawupafesu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609496f460c52---22523466194.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_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 17196 bytes
SHA-256: f15c2a0542d26c475bdd43fd3fa325ec0f71a6068ca3c084d410c1fc7bb8c324
font_02_sfnt_off00013b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B11 10688 bytes
SHA-256: 6dd68fb2e4e9615af4fa28400adb32d76cc4c14b99cd4d7240866109d1c2843d

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