Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c123959fc23f523…

MALICIOUS

PDF

69.2 KB Created: 2021-09-17 19:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24202bd07fd35f44020649b2d901e3f2 SHA-1: be87bf9082b6590466276bdb27a35dcc22a01add SHA-256: 9c123959fc23f5238bf2e31f5d2289edcebf5a8361d88f7dca8e4e65101f2ba4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, including WordPress upload storage, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF format suggest potential exploitation or redirection mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://krisoc.ru/uplcv?utm_term=re4+mod+apk PDF link annotation
    • http://www.alfapilates.pl/upload/file/pemenoposugazepufof.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/79558415630.pdfIn PDF document text
    • http://wwsm-us.com/files/file/59214552786.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/85050908303.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/69175311450.pdfIn PDF document text
    • http://geotersrl.it/file/97694269046.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/52429021891.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ae9672208d9c5821454b14754ae09591/81548552063.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/lusibivonaw.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/88998735382.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/23236903683.pdfIn PDF document text
    • http://tayles.com/uploaded/86015229305.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613664bad4a09---11900515202.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/64985109333.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/tozusewes.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/sasolevutaletu.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/55163820812.pdfIn PDF document text
    • http://chikatere.com/Upload/files/dabijokobovabodogowoxuno.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/35834584761.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/1694475752.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/waxugug.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/putesojiwowofeguranobexef.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/48920344077.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/62a04a23a282bc97f53ed84fc683e2aa/84202289641.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/53335496470.pdfIn PDF document text
    • https://pr-dienst.ch/file/27993435480.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_off0000b3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C9 10160 bytes
SHA-256: 5153b6635437d92a8f8432fb3ce24fd7e03ed3529b2d10043623824e27083ce3
font_01_sfnt_off0000ca8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 14716 bytes
SHA-256: c3b6162562465ff755f21643db9c5138d30753b75ec4bc568095dad59ae8b871

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