Malicious PDF — malware analysis report

Static analysis result for SHA-256 73db9b26a85377e9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 04:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 72c426a0122ae638b8cae22c67040cc4 SHA-1: 52aa79de5814de949232c0f056078aafdd0a7838 SHA-256: 73db9b26a85377e92dd68251449ffd749c5a51bd6ce2aacc8a804993d200214c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=cheat+war+machines PDF link annotation
    • http://hiroi-es.info/yamituki-n/uploads/files/17687020130.pdfIn PDF document text
    • https://camelcarpet.org/d/files/logoti.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210909_944DB05B57E20B13.pdfIn PDF document text
    • http://koala-al.com/d/files/wezawovepunugav.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/ranafine.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/67164362954.pdfIn PDF document text
    • http://classtool.info/upload/files/kipem.pdfIn PDF document text
    • http://ahchala.com/img/file/betuzumo.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/mobovelipeso.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/16764426918.pdfIn PDF document text
    • http://machulski.com/public/file/27479403069.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/rurinufetuvikawew.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1614393d40a7d3---vitufu.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/wanuro.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/dixepanirim.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/9cdfa3e813232d621c51e3443df39b8f.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/mubabiputagixuzom.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/vupupin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc6664a940---terusizaduvanubudara.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/8f9rtjn387e59t7ifp3ap17gqg/89992759368.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/rezagazo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161403f550762b---68175550268.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/79719058821.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/debukikatesiwoduvunesuk.pdfIn PDF document text
    • https://edusfera.pl/upload/file/3186348238.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/78319723650.pdfIn PDF document text
    • http://steinemann-ag.ru/33059504272.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_off0000b3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E0 15276 bytes
SHA-256: e0dbe656201f0bdec9923d1599b84e47938a4dd52182d3309891d7ecb63dcf91
font_01_sfnt_off0000dab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 10448 bytes
SHA-256: e9b188fd574d305d56d3ec8fe637cac768ddfdb6d2e99280d8a9a733b14bf2ea

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