Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd263ec6f1ef8770…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 11:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 583ebe6385c21b781a75ac23a88e43e2 SHA-1: efc5231d22a8f22c98cd3c58854859e75f90cfb0 SHA-256: cd263ec6f1ef87702e31ff15cff40737718eeb49bccef0372fb40559cea24827
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm pointing to compromised websites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=how+to+download+ola+tv+on+firestick PDF link annotation
    • https://dananeye.com/uploads/files/202109272327066568.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/giwaza.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/20019447764.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/63071161038.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/76dc40b74d6be2e66f8ee0df3a65c8bb/kusol.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/jupabikonigawovenupubo.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/61455390992.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/tadovusovor.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/gajatabavesakitubemima.pdfIn PDF document text
    • https://braus.uz/images/shared/file/85058007724.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147192228be5---xijebew.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/musufotugopafosuj.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/seravumipapawevilesas.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/lagunokuwebegokupom.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1615004dce58fe---gepisagipolajog.pdfIn PDF document text
    • http://packamate.com/userfiles/gezuf.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/79581906330.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/wijukafotijizenowin.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/67203981430.pdfIn PDF document text
    • https://kondoreskiss.hu/term_extr/files/jaxetanomabovadalomiv.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/96091215406.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/fakivusemezajezek.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/11443640005.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_off0000b3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C2 10704 bytes
SHA-256: 1ec3a24cabab56dcacb5fb7ef4fb80236765870249a4952bc1cae8bb4e0ab08a
font_01_sfnt_off0000cc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC77 17460 bytes
SHA-256: 2947f0231c0aebc905f12a18cb5a167746d01a172aaf75deddf00db26c571384
font_02_sfnt_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1