Malicious PDF — malware analysis report

Static analysis result for SHA-256 f892962edd35a100…

MALICIOUS

PDF

74.4 KB Created: 2021-06-28 03:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea47f8f267c0fe69ae80b11f4f0e7f2e SHA-1: 04c99b76e03719f6e9ea7299f95a7e222982fab4 SHA-256: f892962edd35a100dc2cc76416f52d0b1681a265bbf855a4275a01dca4b117e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae8a0485d---79844817028.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/40cbaa5197f77e534fb46a15f3afd352/7457478383.pdf
    • http://rasmesafar.net/basefile/basefiles/92036320976.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d023734b1c---91080291569.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090e99c0521a---10695800763.pdf
    • http://crackershrimp.com/file_media/file_image/file/bawozaraluvovuxikofopakix.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835cfcdff8c---93560862972.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7e5fda429---xanegeza.pdf
    • http://vtvxm.vn/userfiles/file/51112841067.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160720b0849fe1---vagase.pdf
    • http://pc75.net/upfiles/file/1622941357.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a00b74f1137---6339548981.pdf
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/kukimaxiwo.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1696b3dfc---31850139297.pdf
    • http://bensonlandscape.com/editorData/file/jalisu.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/3657c56eaf354f8dee6fef4246ba1d84/tewewupakujuvilokukotozus.pdf
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/95614374173.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b74dedbfa09---95058295801.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce67753e06a---19193009930.pdf
    • https://castel.ro/userfiles/file/99244825966.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9e7abc6bf6087fb43b752d434296201a/zonar.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6c7b40dd4---21538025851.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=demarcus+cousins+presents+boogie%27s+comedy+slam+123movies
    • http://e1pl2.nazwa.pl/busy/fotki/file/89808382885.pdf
    • 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_off0000bb1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1B 16792 bytes
font_01_sfnt_off0000d32d.bin
5827e68d3df55b30b3a1d109bb164a07c54d456d1a02b0ecb2e4c258953d7dbb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD32D 16676 bytes
font_02_sfnt_off0000fea5.bin
0b0d48920ee8017a6b708f9ecfdf8813dfcd5d7f40288c8341b80c5834a8f7ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 11656 bytes