Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87cb44cb49da02b…

MALICIOUS

PDF

85.2 KB Created: 2021-09-13 01:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d9a4ac72eacaca60175707ace108637 SHA-1: f56102c89a853acf20a3215c75b93424000c78ed SHA-256: c87cb44cb49da02ba777f5b53676b63d8a0328c2ff7a0cbe4b62becfb517017e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristics strongly suggest a credential phishing campaign impersonating Microsoft, directing users to the URL 'https://inwebjor.ru/uplcv?utm_term=sign+in+hotm'. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://inwebjor.ru/uplcv?utm_term=sign+in+hotm.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=sign+in+hotm PDF link annotation
    • http://vetusmeter.com/images/upload/File/sozulizabesori.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/44737164752.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/lugojate.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/rujarusonezu.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/xokikukanudebatilanuzaru.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362cb368461---mujasozogidiwotoxosuju.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135273680d3c---kifeletef.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8c1612cbaba120a8346901c41f72f6f0/10458825280.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/xigovapanuz.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/59116851628.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/vumabosanojegirakiki.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/73926052274.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tinukagenisof.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/56200403692.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210909_A91549371D5A206C.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/pimemobufatigajira.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/rugevujubu.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/40245196989.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/44064486066.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/sibavotusegalukewetemu.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/pazipowasi.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/kokapuwu.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/55155795317.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/liputelibasaboderil.pdfIn PDF document text
    • https://rafautama.com/uploads/file/49300523205.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_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 10024 bytes
SHA-256: 5cd42561b9a6139d1f5eb89803723804325f9bf23448b177285a11e3d930e6c2
font_01_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 18012 bytes
SHA-256: 009faa5b3d4200f4ff601a151f338c9f1152bf119175fca985e0f98baa4fa673
font_02_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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