Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a15bbb91b6db659…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 15:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aab303b89b7041c3b7b0576022bb0ff7 SHA-1: b88004dbb5276e1e9808d7c4bd3d0b9112d31298 SHA-256: 2a15bbb91b6db659204a1476f9be0a4ac0bedae59f0f2a3f702ce081ffe40643
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613243d84a298---letawepigixibigularevero.pdf In PDF document text
    • http://ganteltechnology.com/system/userfiles/file/kikisejokadeletuka.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3fa08b202---54030891960.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/dokawewuna.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8es08n0p8gpv7l838j2qa6si50/2283867688.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/plk56gehclio7ek6mfv1klht8n/12589574554.pdfIn PDF document text
    • https://edusfera.pl/upload/file/83802554969.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/17981926523.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/44360528241.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/76257177963.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/mamijabitafarig.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/62150006683.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/19125811295.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/sipite.pdfIn PDF document text
    • http://erdbau-rauch.at/53713555889.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/tetidurowob.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/renepuv.pdfIn PDF document text
    • http://enewind.com/pliki/file/musanaso.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/39079168140.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/xebilataxafilural.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/70333854452.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/45814249786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+picture+of+dorian+gray+full+text+pdfPDF 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_off0000e423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 17820 bytes
SHA-256: 762038c0962f2e960ab86c54626b0cef64d0c71a903a5bbc84adb6869b03646d
font_01_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 11012 bytes
SHA-256: aa8743a0b794e8101bf7b93598c9f558a0cf38750ee9f0c1f8a92f4f22b56b0a
font_02_sfnt_off00012bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1