Malicious PDF — malware analysis report

Static analysis result for SHA-256 e011cbff03bf1d79…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 23:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd5d002d642971d8875b9dead2334d12 SHA-1: 5e300e24dbfc21e2dced4c48d95ebb1387069c8d SHA-256: e011cbff03bf1d79e62daea175f1c526cd9a7100f0e76aac1343b3cb146843e5
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

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://petek.biz/resimler/files/kekutupulufuxesoz.pdf In PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/kawowizopepoposo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f58db5e9b---7892843736.pdfIn PDF document text
    • https://schmitz.cz/res/file/zebif.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f827b01762f---dovoxesusujosadan.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/75356117490.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/jekekurumelozafe.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/jikeroxifaxi.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b4687eb29---vojuribaginakarejep.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/wusosos.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/lulovesifemuvatasi.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/42543605457.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/giquhg0nv6uqauql7pe9nngqjj/jinijifikadimiwiji.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-13/20210813224356457630.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/99006914295.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c18b8a6af73---wumozo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960b14d8f93---geselam.pdfIn PDF document text
    • http://beiks.info/public/file/95021727268.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/jipovutibetunufid.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd60e733823---jiwujozilofuzozob.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///43611498546.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/vobemuvosumabesobipune.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/11488053428.pdfIn PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/82105266258.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/gojugaxakatoposukivaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=creative+writing+worksheets+for+class+1PDF 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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 10944 bytes
SHA-256: 36a5ad030bb871a171aec1ff1cfdaf3da8e09e11d2f171af24ff32a339171582
font_01_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 17132 bytes
SHA-256: d6acc0981788ff46153c25272f8ad8710a49666b59a68b5c6e17740138e501d5