Malicious PDF — malware analysis report

Static analysis result for SHA-256 507941b7623beeea…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 03:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 481b80c26552d42572cdf491d76d5126 SHA-1: d37a380617ae5f355710e8b540f263f4f821b16e SHA-256: 507941b7623beeeada4e4cbd6181e7f30905513608c23a966771743cdeb951c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for a phishing trojan. It contains a link farm pointing to numerous external URLs hosted on compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=app+cloner+latest+version+2020+apk PDF link annotation
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/38f2d2d79d6d12bba754929051f76aed/mizofaziwefolixetukekaf.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/webasedapidelemukoleg.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/27128459370.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/6758310091.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/52606554324.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/24650314951.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/20107657366.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410de3122f7---34895601597.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/zobolojotelaf.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hhetvbqu7904o31350ntn3jiu4/1465031322.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613421f1103e8---gifejofexitupamogido.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/c28b92a22bbf821a99df7f2c48cb8ea4/zibomikekivakonedoko.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/lefepowedakuze.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/66916087447.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/43594799434.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/3463590388.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/03ed098d2e3187a87824dea99a7a5fbd/mimivikuroradatedos.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3db98710d---88533351825.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/noluvasadexopigaz.pdfIn PDF document text
    • http://llux.vn/uploads/files/tuvazojabo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/i47si5tqcqallsdo5reerpr2ah/badarefutujuv.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_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 10748 bytes
SHA-256: 2a1b6567032beb79899b7cf962ba7b2f0c4b9cc6d156aba554e52ca24cb574c2
font_01_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 16904 bytes
SHA-256: a5af2044314e2631d07749effb604f0691f1416dcc60a4bf95df7b5f45519ed2