Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3887e6cb85fb98a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 19:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b165c0ff7b7982331e7229733fb5b010 SHA-1: c10b4f4618e9813bb403b15a06333dfb22ef3afe SHA-256: b3887e6cb85fb98a714807cda7c32c5312f22866cbb05a22eaa728e5c0813b1c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://galettedesrois.eu/userfiles/file/duvepebix.pdf
    • http://zlhk.ru/upload_picture/file/garagunojeraxuwosafaz.pdf
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/vesizujisatujagope.pdf
    • http://podolsk-kondicionery.ru/upload_picture/file/finurugiboruxanugowovuji.pdf
    • https://nabsangram.com/userfiles/file/wigazifexuderevigebadu.pdf
    • http://zhengfutz.com/v15/Upload/file/202191323643663.pdf
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/9037780593.pdf
    • http://elsped.hu/files/file/vikefik.pdf
    • https://iqrainternationalschool.org/_assets/files/82953134469.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613060bc8fc38---37167318292.pdf
    • http://jr-bang.com/uploadfiles/20210906110210.pdf
    • http://h-st.nl/bestanden/files/mudaxa.pdf
    • http://cdenito.net/userfiles/file/zujivabinajog.pdf
    • http://preiswerte-unterkunft-papenburg.de/mediapool/96388363970.pdf
    • https://rakowka.pl/userfiles/file/sagajakemutete.pdf
    • https://aecvfcom.nrgence.com/upload/userfiles/files/pupuna.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/4519532778.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/5048670314a3748bcc27c555a69f47b8/1170318428.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a52eebb0---bobadenafodupud.pdf
    • http://vet-spb.com/userfiles/file/42860625394.pdf
    • https://fnb-concepts.com/images/uploads/files/bixekotirifafin.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=my+personal+hotspot+is+not+working+on+my+laptop
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 16792 bytes
font_01_sfnt_off0000ebea.bin
2a6103956c06221b602ca3c5e66f9fffd20d60f93fb8ffc160c27338a6a165e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 17324 bytes
font_02_sfnt_off000118f7.bin
8ad5a8e201bb42bbbaf7f9b1f50ce35319fd8f774c1388fb752601dcd8667a2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 10984 bytes