Malicious PDF — malware analysis report

Static analysis result for SHA-256 1678d794ce81c2c3…

MALICIOUS

PDF

95.2 KB Created: 2021-07-04 17:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aebb85aeb321ffdf07086fe7634f4beb SHA-1: 94d31dba1290c115aab3ee791b4b51caf07c9b67 SHA-256: 1678d794ce81c2c397a1e9af5a3dbc6cab01a5490d0c453e21b480285927b65d
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://clickkedai.com/userfiles/file/61450772288.pdf In PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/946sh59cogg4mb6jnjpj0spdgs/35680147438.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2b943a1fe24bbd28fd83040f81ed2f52/wuwijokudetopatepu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8afe6f2c7---zoxupurunejebazeruv.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/0c58922155ce832afe1fca0621c32118/7434790026.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/kerutevebifofasivelina.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35ec973a44---74949748816.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/54303a8e41c43f4f00ff909c333f5a96/40732045420.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/41556f5a815f036059bf16f33c72aa8a/9542536173.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787964af14b---bovilatovalebulosugozak.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/xogukibuxepupafixij.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0df586797f479de5993b53e4611b93f3/40337912811.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6c6457d83---dafevunevibazi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160899691c21aa---25323014269.pdfIn PDF document text
    • http://abworder.com/uploads/files/vefimugu.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/mamufelekafukepevowutese.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/6724134770.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f68dfb42bed0006afe160a9e9d4ed2f5/33518770722.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/nuzevuxebanibaruvorujad.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/g2a0ja6mi2m9e3fecbmpskjt45/fekalupu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc46ab5600---nozimabazete.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081d915b171d---lurugog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dummit+and+foote+abstract+algebra+2nd+edition+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 18620 bytes
SHA-256: 986c4dbc6240df69ae7984fac3aa9e58d13e74948e85099cc7f381f1e58f1663
font_02_sfnt_off000154a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A5 11412 bytes
SHA-256: f6e9f6756e52db3ad3d3e19f212eebf8ef72ed0c22314c8b3aefc0d13961b736