Malicious PDF — malware analysis report

Static analysis result for SHA-256 d034f260fca365e1…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 08:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a88f4dd2aec0a72781e4b398c0469c6f SHA-1: 851bb6790accadf927d9e8641d0f6eedb1fe825d SHA-256: d034f260fca365e14772c18c2c6ef4000aede6eb874eb362ab8faa4b72656bcc
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs like 'https://synerhu.ru/uplcv?utm_term=document+reader+apk' suggest a phishing or malware distribution attempt. The ClamAV detection 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=document+reader+apk PDF link annotation
    • http://topspeed4wd.com/ckfinder/userfiles/files/vafupokipuw.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/53638616506.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/20271877831.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/50852722718.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5d6666fac4c53303420add42cbdb484a/sowesupamavuxokotofogaj.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/wobajasejixemomuwimoso.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/25938494343.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/gakumogakojawim.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/zasitijam.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/mavunawuxid.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/59538405267.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/50192226714.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/tisiriso.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/lameluxapoxivufozemav.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/93429960946.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/segudunavatigosi.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/dobarinebefokidekez.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/sidurozesikelisomo.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/93817244054.pdfIn PDF document text
    • http://393citizen.com/upload/files/xuginagomase.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/499c763d7a473e51825a883a9547eed4/91782860015.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614574c953d05---43205169240.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/29247903417.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/fidobogabupovepozur.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/lewomawe.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/wofexiji.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_off0000d0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BA 18084 bytes
SHA-256: da0f77c19aa39aa9684679bf9640c059336e934d9d07d519f2cec13a36662912
font_01_sfnt_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 10560 bytes
SHA-256: 5e3ea4ade1808f779471fc5f97f5c5d2e11289d9313088fb83ecf0a93d9f58c3

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