Malicious PDF — malware analysis report

Static analysis result for SHA-256 e854d11990ab6735…

MALICIOUS

PDF

77.1 KB Created: 2021-06-27 23:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 443d95b5633f20e1856b8feb29aeb95c SHA-1: 18806b2cc9f35acaaa22def404b0743207ef486b SHA-256: e854d11990ab6735fb68826db433b3b7803780828e0b95f71ebe0c1458044586
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. No scripts were extracted, but the presence of these links and the high detection scores indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://wastran.ru/uplcv?utm_term=wordscapes+january+17+2021
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/fa552db43dbb46eecbfbcfa04f91188d/17582730201.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2066ec8b52---65345396178.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/071ec6b17ca28ea3ea8433541a4c00ae/72986968580.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a7d3ec03---fafewenovilumuxok.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/2e4bbc5f3e591b4a50080e5b9257e98d/36493398881.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/pq9nn0l4fn8ftefjskva8lqifi/48570808096.pdf
    • http://interiorconsignments.com/media/file/pepadaxabugovapuse.pdf
    • http://eko-inwest.eu/upload/file/rivudeto.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6df4882aca0ed3acb0395da6bf0a10b5/95507222764.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b653e1c138d---dinozixufelugarokobawa.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/63507182048.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6239c1506---wanajefunagawewumijuza.pdf
    • https://an-professional.ru/img/files/file/rovopikusijixovugisu.pdf
    • http://beiwendq.com//data/attachment/file/75709972658.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d2bd3dcd4---75520726692.pdf
    • https://rrr71.ru/upload_picture/kinupetevupabatonojunomok.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3b688342---12085131306.pdf
    • http://bigband-ulm.de/userfiles/files/64011665493.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cfa7e813e---kofiganodoxufifewilofiz.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/7fd1dda6dc25f0c0f5ed9cd1e1d82c11/77214959116.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a17e4d7c44ee8f7c02371f5dc229a44a/dutorozov.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091021a12384---22965245579.pdf
    • https://accuratesearch.com/userfiles/file/89885515602.pdf
    • http://falerisztika.hu/tmp/xoduz.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pvk8b9g81frrfsdq4qigumf0i0/549939750.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_off0000ca26.bin
062a17d29c875c414bbb9694f9e7eba64cf8d58f4a74268e0edb6528ad029a3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA26 16660 bytes
font_01_sfnt_off0000f539.bin
5b703acadbe6d173b837d42b848031d364ea5e90438c52960edac5b881102f81
pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 10952 bytes
font_02_sfnt_off00010ef1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 16792 bytes