Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5f57e397ecc137…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 10:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ae13f076607a419796762d2a6f3b609 SHA-1: 92ff5bf7fd49a40121c2bca092c0fd6222d95464 SHA-256: 1e5f57e397ecc137f0886f7cd71b791359cbdf77907fa4474cb39136d31e11a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to websites hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://radio-clipa.ro/userfiles/file/4491918015.pdf In PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/pololujatunufotisamifur.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/63802393451.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f32c0c5513---34957489828.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/virajebataneresaxifut.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/45917610683.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323c1b106a8---pizupopepubukular.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/91234599498.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/8584635994.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a8ubv21t29rmcopr955abgkl5h/15211859358.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/399e81bb03f9514438fd157d1883758b.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/gifunoxuwuju.pdfIn PDF document text
    • http://mylodge-naoshima.com/bukeweligimi.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/bijunuxebot.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/29693827292.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/koxug.pdfIn PDF document text
    • http://xhzhengli.com/upload/jasurododapapukonuje.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/93225635098.pdfIn PDF document text
    • http://peoplefoster.com/pliki/kowevexise.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/1613431905.pdfIn PDF document text
    • https://unaizahic.com/Files/files/weridasifupit.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/295b3bf2244dcd0e05ffbaf446b9d01d/jiligij.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/5l6meeeus86h51io67ms8j0i8f/bivonetidaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=art+set+4+android+apkPDF 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_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 20232 bytes
SHA-256: 50c3ed5bee9102e33a957805709912a436ba9a97332c02b27fe307b1a09fa306
font_02_sfnt_off00012663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12663 10488 bytes
SHA-256: 5bc1368f9ce992f118a7e87076c3cbd4a70e9d1764f20736d8df542d16e8aa32