Malicious PDF — malware analysis report

Static analysis result for SHA-256 d216b555f240d99d…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 13:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 002dd22dc3fb2d9e50dc1f8664c32ef1 SHA-1: e9f87c5ac7b750d729e49480366ef2abac0a9fd9 SHA-256: d216b555f240d99de240933b80182ea581636f0871e091f2977bae2270222f86
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aviatroglo.fr/IMG/file/rizukenufawanaf.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16142016ad3d04---18576542846.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/geluduxaga.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/bojizatejexedagepuxeti.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/72822956724.pdfIn PDF document text
    • https://rjpexport.com/files/7706612756.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/bunigamudabejorurifo.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/44870848695.pdfIn PDF document text
    • https://suruburi.net/mm/file/46825568621.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ab30db683---duxanuwibiziw.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/pamifigonojebaporinuwizu.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/87038830298.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/37470914988.pdfIn PDF document text
    • http://pi-consulting.ch/download/73021011548.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/46978013283.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/xebolapovopikovuratekipis.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143b59637187---demomuwafuguvozozirojowa.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/diwibewoxuteze.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/89983918279.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/pokenikume.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/72695479048.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/8a6af387e31e7153962c47eac8e99d02/jaleve.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301a2f57578---tetafikovewala.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/sevifapoguravemixe.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/72105616876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+5+100+mb+download+for+androidPDF 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_off0000b18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18C 10788 bytes
SHA-256: d42383d6bf4b52bd3f8289f610b4b1912be9e1ab57914fc14633ebb166490f23
font_01_sfnt_off0000ca75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA75 15100 bytes
SHA-256: cc272ec8cff4bd31a03e2f282e7c372a8cb666913974733f0562395321f74e51
font_02_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1