Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3a46086187dc97…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 04:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d5f38d6b8ead8a9f5fa95d95b7a61ad SHA-1: 25867b81a2d4ff4a8969f3c9757edf9878110421 SHA-256: fe3a46086187dc97047381eda45a79bb52d9e1f1c4d17545ee0b73742f899386
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to harmful content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leise.ru/admin/ckfinder/userfiles/files/82542209237.pdf In PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/80530668206.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/bidemurupofalasufizubut.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/67ef30e19f7097d99a25ffd7e33ffc41/vekozitenegidalozaxutoz.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/611d0e72f7cdf77e34e8af2cb0278af3/jexojizevaponulurab.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/fadinoxaja.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/34579900515.pdfIn PDF document text
    • http://otczenacts.com/media/files/nidujuzovajomefowo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135d2ddb2c07---18219015550.pdfIn PDF document text
    • https://fond.ru/userfiles/file/25603639738.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/reninibofaxugevetigin.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/33421216161.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/89676882032.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/55641066740.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2e431134---gitegopuxogamila.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/73539582142.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/90199594221.pdfIn PDF document text
    • http://tradotel-riviera.com/file/24721119717.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/jm3lrq2ub2oa4faqoh3se7rrp3/87041264628.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/4167270925.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3cf26142400dea493d464b452a912673/52485544499.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/vadatefuxaw.pdfIn PDF document text
    • https://tekmaker.com/upload/files/5655167107.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/73918537697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=vidmate+all+version+app+downloadPDF 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_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 17868 bytes
SHA-256: c281972e3de508774f2c9fe5ff2a5a87544deaae25946ee5d1c2dd15e5023a79
font_01_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001240f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240F 10672 bytes
SHA-256: 7c3a4c7f79fd50347ffa6cc31688f95ccb830bf89f48d8342e8704c33c623465

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