Malicious PDF — malware analysis report

Static analysis result for SHA-256 6259446ab3117d58…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 21:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fe56374a14b9b694d2372c83357b4ed SHA-1: ee768d9f347fbd51cadbbf2f3c01fa914ac71e27 SHA-256: 6259446ab3117d5885d012d1538575b96a327b845fc1915048885fdc424d0eb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410fd377f4d---zafiwuzak.pdf
    • https://facades-et-traditions.com/actualites/file/59022912498.pdf
    • http://fongyoskert.hu/userfiles/files/22259464720.pdf
    • http://lorichphoto.com/pictures/file/43724048947.pdf
    • http://dokumsuzgec.com/userfiles/files/jobulugusi.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/wijetetajelanimagadinever.pdf
    • http://cesvil.it/filesUploads/file/tiloxukojinek.pdf
    • http://ahjygjg.com/upload_fck/file/2021-9-11/20210911075416647953.pdf
    • http://skupka23.ru/upload/m/91923246899.pdf
    • http://vitalchurchesinstitute.com/files/file/denite.pdf
    • https://trainova.com/userfiles/file/figabimiditowabu.pdf
    • http://highendschmiede.de/highendfiles/file/60023891356.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca13326f0---73150790100.pdf
    • https://taptigrihnirman.com/singhania/downloads/file/jorasuf.pdf
    • https://loyallcanada.com/editor_files/file/88670897325.pdf
    • http://iranjobex.com/cache/fck_files/file/jazemolazujanodapu.pdf
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lorilizesak.pdf
    • http://runo34.ru/attachments/file/xegugonuzefijomalesaz.pdf
    • http://botosani.ro/img/uploads/file/xijejiteruma.pdf
    • http://szentdorottyapatika.hu/files/vakenajejumadefufob.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/41417a9bd15bb5690ed9c65c2289daaa/99285593652.pdf
    • https://www.scmsgroup.org/ckfinder/userfiles/files/sebegakad.pdf
    • https://spa-salon.ru/ckfinder/userfiles/files/11867470340.pdf
    • https://terrebleue.org/userfiles/file/vafaf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=waveeditor+for+android
    • 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_off0000dcee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 16792 bytes
font_01_sfnt_off0000f500.bin
a30c649832284e92dffd3fdb8a651c4cb7f267ceb709b05aef763ddf8d36a93f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 17072 bytes
font_02_sfnt_off00012158.bin
8bd5dd9dc3af6f7a8350212f15660fe0e238a7fb02010b541087f4a6b35bcdbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12158 10192 bytes