Malicious PDF — malware analysis report

Static analysis result for SHA-256 5811866c2c94e984…

MALICIOUS

PDF

79.7 KB Created: 2021-09-22 17:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54083cd7998c2d729b1031688d518909 SHA-1: f6268d8b655bd7ec14b88a46cf857a58c4cf0cbf SHA-256: 5811866c2c94e984cdda523c077259f00d59a0be065373e27c7a942bfaa92dfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and a high ML score further supports this. While no scripts were explicitly extracted, the nature of the URLs suggests a phishing or malware distribution attempt, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://chcial.ru/uplcv?utm_term=super+mario+smash+bros+rom PDF link annotation
    • http://learningkey.org/userfiles/65495469739.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/12975409343.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/26109654131.pdfIn PDF document text
    • http://acril.ru/ufiles/files/sebiwikeginuvinuwume.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/sarotiz.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/40166600658.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/jizureniwodela.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/64476956208.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144fa9fa5e31---4789155724.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/leon8j8g3vhu0hb2ak8toa8bn0/692124359.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/87621120639.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/89318098532.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141b03790f02---tisowuvota.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/51883519884.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/88314492815.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c6d3b6681---fesured.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/92684610106.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/kaliv.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/88262141688.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/vojojexer.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/bawedazumi.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/28ffacab262eaa164542c7a2a8901ed0/40910307277.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/99081173263.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/19180419955.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/96502085940.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/87682640354.pdfIn PDF document text
    • 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_off0000d131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD131 18648 bytes
SHA-256: 9f086dd779582949808f682cf721af855d47640372ab1aa5e139b0f6a3ef86f2
font_01_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 10584 bytes
SHA-256: 5820a0d1dc50c574dd2e771dc0ea944ed7396e05f83c186e975f77c7e7ef3427

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