Malicious PDF — malware analysis report

Static analysis result for SHA-256 44752bb023611267…

MALICIOUS

PDF

72.4 KB Created: 2021-10-08 02:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e550da011c96120c50430e099dd604d4 SHA-1: b8c56849a8a59f126da4dea8365bb959b33e7fb8 SHA-256: 44752bb023611267d64e896a0980372e20b5ab9e5c675eb6504f0e106bb0ca11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://danfort.lv/userfiles/file/pevedovupobaxizebikom.pdf In PDF document text
    • http://nabisori.com/userfiles/file/lasurexezegevekumebekire.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/bejujirujezukige.pdfIn PDF document text
    • http://chenruichem.com/upload/files/tadesufiguku.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/dizagekaf.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/4819931205.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/lexijubutun.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/46986627613.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/zibotepilusodudorine.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/77405228359.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/bazazokavemoletalananitod.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/forapojizutabodo.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/kabutoxuzazuzaroxebego.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/99019385268.pdfIn PDF document text
    • http://garderoba.sk/images/_file/82409922454.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/josorun.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/66415662810.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/70708856910.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/17993402321.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/361op1l8c65oe3qfgqe9gtlgq1/47273843707.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/9598723545.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161468e8da9245---potogebuzewomatifonegosuv.pdfIn PDF document text
    • http://slsnn.ru/content/file/77424473355.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151ec28346b7---gesowawer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=make+a+choice+for+mePDF 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_off0000b9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D4 10268 bytes
SHA-256: 9a05ec61e43e9700af52d1bf2c9faf8b3f163d9e25d758c2369efda294808c50
font_01_sfnt_off0000d0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EC 16640 bytes
SHA-256: 6d4189a55c3b4bdf2ff4ff50641f2435ffd169eb0041e11610ed14ec8d922f8b
font_02_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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