Malicious PDF — malware analysis report

Static analysis result for SHA-256 9259755bd6f50035…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 20:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd22b8f3e50b24188d953efb29ff4cc2 SHA-1: 50c9646abd7f3f808ca3360b4d07c2eda30f7a93 SHA-256: 9259755bd6f500352319181bb3f1ab6fdfc9bf964b5be317c6617ec7a3432997
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 compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm structure indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/40b2087393852bc24fd9f620ef43a222/42471195570.pdf In PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bbb6ad060---45584082255.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/3c145a0dd6ab25d3f193d3d94e8e8c25/mapazamebum.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/59c61d09d8a763e9c7e3ec0409409b49/gadatuwuzumenijopibogawu.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/dipakivapukuxanopuj.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///woniwulem.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc3fa3f4f---jatajifobolo.pdfIn PDF document text
    • https://airxps.com/userfiles/files/81815832381.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/pozoluwikoluju.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/79980615853.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/zipebijatodepuxawe.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/14088063731.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/dmlgnrhraslb7hcjdldba71olj/58261976643.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/1d809b8b5d2313cabf5e388b92bda788/19353530356.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c8a75000d---84547563515.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/fumav.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f75f8d37c---filonex.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c6a1da70d---goronajiji.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/65dd0b32497e0839450c6700dd0b51fc/39072809184.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/13691704173.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/55f6eeaf429e747f1278cb1516d6de6d/44231560952.pdfIn PDF document text
    • http://qdjshg.com/files/file/dazofebajaratadujejagupom.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/vemeparagulevesab.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/59466363604.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4912276bdb097c17d5587022bd3a8056/rumulinarusitag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+beatles+for+string+quartet+yesterday+sheet+music.pdfPDF 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_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 17044 bytes
SHA-256: 88cead28f4a675397c5625775ee860459eb1d752e01159cb3ad488927ea364a6
font_01_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 11596 bytes
SHA-256: 55cf1d4f9842a2c4c268e78a164634b9377f9d00c0edcde05077945ede98ec50
font_02_sfnt_off00011c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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