Malicious PDF — malware analysis report

Static analysis result for SHA-256 75017db6d8b960f1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-22 22:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b222c052c8defbeee13d137c167ecbb4 SHA-1: 2882f95a60e6ea5180e85c237fe3fecca470f394 SHA-256: 75017db6d8b960f13cc8d04d48b89632d771853abd9a60bb7b45180af73fcd0a
196 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=four+letter+words+ending+in+v PDF link annotation
    • https://uzmanwebci.com/calisma2/files/uploads/meteke.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/tijesob.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/74683610923.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/32210875792.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/nabamosifabevevoxamimig.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/gesuvuviragisimet.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b35208e55---vuzakosixupigegenisoz.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/13612463108.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/notukep.pdfIn PDF document text
    • https://pokereshop.cz/data/file/18581805464.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/gevafinak.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/64714158141.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/k2m5baphpvv0g3cgg2glkcj4vd/dezinelomigitapasifetuv.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/91433193307.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/91924303707.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rofonujikasonepolijuz.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/53893441245.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/35732620451.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/fugokitezipopa.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161360b9a068a5---xokiloxu.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/34068502329.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/29245264938.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/zobavixuzano.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/wobadipoxavig.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/guwofumegosizifunowe.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/141033456075.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_off0000d370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD370 10492 bytes
SHA-256: 0abd1867ea443a2a7e3083822b52d2d193eb3f91b8ad3c2057ac12b6c09c800b
font_01_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 18380 bytes
SHA-256: b1d3ce1065587843116974dd420e6fee99dd5129102698c993fd5253ee062ebd
font_02_sfnt_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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