Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82a1134534a472a…

MALICIOUS

PDF

88.3 KB Created: 2021-07-04 14:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04533fce1a9b215422058db6947d98ad SHA-1: cd4b8399d356390e1e51a7dc6fa235e209db0770 SHA-256: b82a1134534a472a101b90818f890faee8e3952968de1e0f66f7dcc96ac062bc
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 WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8rvs8nnv315e2ggjvjlkpsbsm4/dipumofabobidexiposen.pdf
    • https://betentour.com/sites/default/files/file/76773898885.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cfc0cab43---ropiwuzugukorigabojofele.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b6228f63c1cf8984e00fe8387a72c08/96085339202.pdf
    • http://skybuildinfraprojects.com/uploads/29108805359.pdf
    • http://asbu.net/uploads/FCK_files/file/95275338267.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b65ae68ab7a---dixewowojat.pdf
    • http://amoy-art.com/Upload/file/jinumirilizowadefojax.pdf
    • http://studiomalpocher.it/userfiles/files/9530787838.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e2161f8c---pisaxuwekosezoxini.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a145cd19c1a---dodenanidotiwis.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090770a6467a---50085207646.pdf
    • http://ratchadatitan.com/UserFiles/File/51100731008.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cfddad077---50874936775.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/992cm2jovjmdd8ih12on4of052/baleji.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609208a5ace48---damigusoram.pdf
    • https://adtw1.com/ckfinder/userfiles/files/rufodukuviwaliw.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b284afa7e8c---57829452932.pdf
    • http://drukarnia-warszawa.pl/pliki/file/92005604369.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609efdb4946a5---jubupeva.pdf
    • https://mwasafat.com/uploads/files/tufazuwukalamiwivov.pdf
    • http://hasyo.net/files/file/fizimanuzalasugoloduk.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5cb98fac83d5106d1df546a8b40200fd/39130172757.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=breathe+with+no+air
    • 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_off0000f77b.bin
704c795dbf4e92b95e9b77633511d90ac183d3e39b503080bf387d970585cf82
pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 10132 bytes
font_01_sfnt_off00010e1f.bin
bb4ee7d4a729119fb0b74a87fdeb7c75e5ddbc97d4411f416b08a87c795c43b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 17704 bytes
font_02_sfnt_off00013c39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C39 16792 bytes