Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4764727aa4310d4…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 06:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1385e72f640c349234c4018458135e5e SHA-1: 333e4d9f92edb9e3b457492f08dfeff9f11c72b4 SHA-256: f4764727aa4310d4d0630e01ce8ac83d53fec89e441ad0cf1098cd1ac986cbd0
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were extracted, the presence of numerous links to potentially compromised sites indicates a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608196e76eb8e---jasegimop.pdf In PDF document text
    • http://kahasat.cz/data/file/vifolodigitegume.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/35862172856.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/82465680428.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/50872073831.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/relijazux.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/pivowevasinog.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/cda08b5854e64b7cbffdbee454fbd03f/xepewejazi.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/69836837927.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/79877359307.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/23494641742.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a2242a46b---65894784299.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/gopidanegudupiloxepewu.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/35832467516.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/peporunifirelobegi.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/gafemesutebusimaguzezej.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/nevutifixu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b1d52c2c3---kamufubanemu.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/44095112779.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d51927497b136a505577d23b11038476/nubaginutebozoxe.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607191dcc4c9e---nofenulo.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/mirodeluritodaz.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/c757a4e7ca28e47afdce6926afa07ddc/ruxemirevazetinupi.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cf36666d6a169d229a94c2ea850b248f/mewiwenebiwezaz.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/namirusizevuduwuzojasuwer.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/88659378840.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b02f4f3b9e3---masebukapizugesotaranegib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ascending+descending+worksheet+for+grade+2PDF 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_off0000c4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D6 10988 bytes
SHA-256: 36ea9d890fc3c5c8e9b7a9454f51d058c85a859e04ec2a6299f6e4edc908fe8a
font_01_sfnt_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 16904 bytes
SHA-256: 1878c701d271bcc64769152bab25006793771012884491c98960c1a42342c0e8
font_02_sfnt_off000109d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1