Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d71ad40f263578…

MALICIOUS

PDF

83.8 KB Created: 2021-07-01 16:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4d08382a1f57f29bb0fc5150438dec4 SHA-1: 7c0e306aea70011e2471341802c6bbcae3343c10 SHA-256: 20d71ad40f2635784cfd7071c43fc6b547367f566a2ec47b86447be4fbf4f0e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links hosted on compromised websites, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics indicate a likely attempt to lure users to external resources, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f84c4fe58---72712906101.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/681ec950e3c5638d7e4dab5bf686a3c0/xexupisekadaba.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa16d492c2b---52228311840.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/8152i3vgp60i8uplec85rolbpc/23997363574.pdf
    • https://walkandsmile.com/userfiles/file/77499300838.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e511a2a5---217222610.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/dd09cf898e9c7ede69201d5579f29982/bizepitopi.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1b466ac8e1f551cb01fa265ea73416ac/retomunuzonuki.pdf
    • https://avigailpekelman.com/sites/default/files/file/midugikojupiwemobajema.pdf
    • http://shengnabei.com/uploadfile/file///2021062800202231.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/f6mf7ip8u64kcrg5qu9tt04q93/47397538420.pdf
    • http://abwmarlboropike.com/uploads/files/87857281800.pdf
    • http://uniquecharacters.com/upload/files/pagapotexuvetawekudij.pdf
    • http://ahkjt.com/upfile/file/bamutelopufudew.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa65505df---90810648683.pdf
    • https://littlelightnepal.org/userfiles/file/fofop.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cj9u0rvbm843sp3kfo4p37e10e/39150701133.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/07a24ff583004457e667398c850e3e26/legorologabetosed.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/fb809bddafb36b9911c11b366b8e3458/70238922964.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27dc44e96d---vopivirobirulugoxovofe.pdf
    • http://www.urbanwaterways.info/files/77627661489.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/dc9e5c4fd9e2c660310eaf1fe4fc7b3f/37841498443.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072004360ffb---95490608998.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jfufnbodsfb3ubtrfq9mdnkjdr/20066308828.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=direct+loan+interest+rates
    • 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_off0000e7d3.bin
9961bc05cff5a3008822142361f7cfbb5fee4324862fabf62c40c06688434513
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 16576 bytes
font_01_sfnt_off0001130b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1130B 16792 bytes
font_02_sfnt_off00012b22.bin
be28a5b5ff9d97427492a54df9d316e625b62ba5e62d33cbd98200df8f804a54
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B22 10224 bytes