Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf32d8d4294d975…

MALICIOUS

PDF

77.2 KB Created: 2021-09-15 00:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95b66c170cf5c98608fccd472dfdaacd SHA-1: e48d334cc595d43222973c28535156f433f0e653 SHA-256: 9bf32d8d4294d975b7a3cd1003c6a7ad3758c05d65c879cc431f93f595c7342b
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document's structure as a link farm suggests it's designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://needychild.org/ckfinder/userfiles/files/molubijozadava.pdf In PDF document text
    • http://khmim.com/ckfinder/userfiles/files/sawakozudoxigubokural.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/bigijuripegazowafaw.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/niledetifi.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/99d85a1949b07b2e84b6d55f788a206c/40483127580.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131780e98cff---megajule.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/gabufakapixedetoge.pdfIn PDF document text
    • https://izometal.net/mm/file/56540601524.pdfIn PDF document text
    • https://andana.us/files/files/25924945078.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/6195323259.pdfIn PDF document text
    • http://imbirimbir.ru/files/90552761270.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090410534773499.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/7418055373.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb81a4890e---diwixemixerokekuxafafewi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a96f088364---vilivu.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/10556963146.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/82889755440.pdfIn PDF document text
    • http://thepducphat.com/upload/files/kalifaropojogoju.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/suruxu.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/duziwelezejaka.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161315a8fe1ad9---xativotifuzel.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/fumime.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/10020491180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pubg+lite+game+vpnPDF 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_off0000c6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C4 19036 bytes
SHA-256: 6ed5e336ae0d90107eda9699be98a630254925f927c6551721c24d48dadc94d6
font_01_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 10512 bytes
SHA-256: 690e86732bfa007b998d69d60991f15e6a08fa0674253177471616aaea94c3ec
font_02_sfnt_off00010f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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