Malicious PDF — malware analysis report

Static analysis result for SHA-256 6336614aa02798c1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 04:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7dd267130ae113475877ba2bdc980e46 SHA-1: 468435039c300aca526a5674d2343948068d2089 SHA-256: 6336614aa02798c17f484f35a6dfd2d5efa7a0a4874dd5d5c74f2cfff8031e0d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains associated with link farms and potentially compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://n-zvuk.ru/upload/file/85672661427.pdf In PDF document text
    • https://aimhc.com/userfiles/file/39712613602.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/94381680894.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d74864ca9af18fef22e126895b9928d6/lenojekulinefabejugu.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/wexurabonerafeko.pdfIn PDF document text
    • https://netlandschool.cl/files/gazobopolanerogoxe.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/fewesive.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/85278335090.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c69e1bd67a5---19124667937.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/kunuja.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/99986684361.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/fd55c01a12adfa6d37eccacb2c922b6b/51792376255.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2ed9ac557b76a84d1eccaf60a638ff79/tebitutunide.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/30743029644.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/vupekegasowubewirek.pdfIn PDF document text
    • http://slsnn.ru/content/file/runumumavukoju.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/seramobexawatuwi.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/8702689468.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/85069393265.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/189bb7348947e998fb79b134efab3fe3/xufobenozifixubimilisas.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/xufezafiwiva.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/84356270674.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/xevibulemiwipate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=spelling+bee+word+list+for+grade+6+pdfPDF 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_off0000dc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 18156 bytes
SHA-256: 61a7d4eb1c9779e6a06569737363f8d9e57056bf10077159beb8832a68d8472b
font_02_sfnt_off000123c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 11140 bytes
SHA-256: a30e56f5aa7795db3fb0c09cd08b3568987209bb4a03a87a0d7787991d5b82f1

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