Malicious PDF — malware analysis report

Static analysis result for SHA-256 1376cce4a63a3cf3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 05:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 69f2ca6ca86d5a661bc20b0a084b6a0e SHA-1: 20afd2c696d576b87887aeb236b5fff8913e97e9 SHA-256: 1376cce4a63a3cf367972e726e391de1c4e64b41a7bd791e0913909e2aa3a2ed
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with many embedded URLs pointing to various websites, including those hosted on compromised WordPress uploads. The primary purpose appears to be directing users to potentially malicious or phishing sites.

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://buka.ru/sadm_files/mataxuwumowakalitupedo.pdf In PDF document text
    • http://paroissedementon.fr/upload/files/60442979198.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c4614d938d79367eb1f19c75cb75db0f/71750953573.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/jubed.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2d0a148dd---49044751324.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/kewelezidagobokamezanos.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/punanofatogotolawajado.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/77389116563.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/bagovogutew.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/23589097068.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd14b7645a---rotixitam.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/talozigakexofusif.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/romamabivedowivifekifux.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/13466866731.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/jijuwomumimufirodujisu.pdfIn PDF document text
    • http://rem-proekt.com/f/file/nunuxunofetakufiziru.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tomira.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/gulewililojutowibonali.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/voxafagegupujas.pdfIn PDF document text
    • https://tipresentoio.it/images/file/zuzugazirevekud.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/xasamovevojuno.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/napasonaxenaj.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/dizagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tig+welding+stainless+steel+pipe+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_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 17288 bytes
SHA-256: 04190fff27c6ae20f96e0389b540a7920c497fcce00581c18f886ce1c606ac1b
font_01_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001235d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 10500 bytes
SHA-256: bcc43d42603341d89656013e5480c7d94e8381b77e4d0b0bccf68af7d2dc762d