Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f12da904bf871ce…

MALICIOUS

PDF

91.3 KB Created: 2021-07-14 09:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cd351b661693deb4b0705a1f7be17659 SHA-1: 5019bd0c16fcd1d24941dbed44303412379f9eee SHA-256: 6f12da904bf871cecefaa9292e89b9fdc42ac98b8b8cb331320ab458363f89b5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of threat. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable hosting, designed to redirect users to potentially malicious sites. The embedded URLs, such as http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/34885688b1ab3cea9ee469e646a6ae75/jaminenipatafu.pdf, are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6126e1933f4a0623c93cbf1fc7271b23/90800269963.pdf In PDF document text
    • https://adsbudget.net/userfiles/file/felutifidowogitebanejal.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080445627c66---zowumewogaxezo.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/wexoku.pdfIn PDF document text
    • https://aful.edu.pe/ckfinder/userfiles/files/15492243052.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050405590473499.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/vtegn4oe3b9hd9gbm8518urr40/dediwojotarukag.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/luxurusivakapifujokidawom.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/noedek7q7p9cn6ir3io2c6chke/57318057928.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/golovulimi.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/pilas.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/65944880880.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/99420837951.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/6561576843.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/92583009331.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/a6077667fe66d62fd394623fe1d09994/larozokeleja.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/8938c324968a05400e0415bf6d04ecbc/7438661141.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210615183106.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/34885688b1ab3cea9ee469e646a6ae75/jaminenipatafu.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86554776761.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/96581937384.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/tepamopavadebuka.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070f6246cb1e---36802401764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=evander+holyfield+the+real+dealPDF 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_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 10448 bytes
SHA-256: 31fd73b8a825ae9585aa41cab2cdd243bfb42874f8d46d0962c8cfcca932e56f
font_02_sfnt_off00013043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13043 18424 bytes
SHA-256: 49d518c874ca4ca4688eb9db1f5eb7da3d3370e51d34e4eddb9acf1860720181

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