Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cbd61b30470806…

MALICIOUS

PDF

67.9 KB Created: 2021-09-04 00:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 516f44d78eaddb82595a6ca419c08bb4 SHA-1: 6c0a3321022f7fff54a1c0f590f77391067d4938 SHA-256: a6cbd61b3047080680900bb62dee0a1bc7331bd35e206bced3c9b5915265f52a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a clickable action and containing numerous links to potentially compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872cc1cacde---jezakodijenewerewonavo.pdf In PDF document text
    • https://larioenergy.net/uploads/file/9366565885.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210706_171018.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ea3d675c632eb0a4072d5b84f0ee47e5/60124294375.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/34003042185.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5fc9efe51f8e716ca7fdd9ebbaf0f0b4/22811495696.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/56396751367.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/q337jmvp2ddekf4f1m6smncnc1/zumijow.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072beb9080b1---25194735441.pdfIn PDF document text
    • http://allasclub.com/campannas/file/20320142343.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/22135060550.pdfIn PDF document text
    • https://tomas-music.com/contents//files/76784737687.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/dcdd26e682bd49982c028aba581d4949/vepiwato.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161215bdf19570---94347997498.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/81cc4a2565084912c4eb909abe94824e/88331801553.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/kobovajafanalofosiz.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ac84a4336448f93b1dac8dbe5af136be/wufidabuvematibeg.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/59400903114.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/37bfb98e897eaf34f6961902867118cd/lamivu.pdfIn PDF document text
    • http://imbirimbir.ru/files/jokigugolexelaxisanij.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/zowetimiwivizozavaneviru.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bafe6a17cc5---57758438284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=denaturation+of+protein+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/97c65246230bef6e70b8f314ea05d410/25120734824.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_off0000b06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06E 10380 bytes
SHA-256: eed57302fc838445078296c9c349614d62c9a6c5a6d92007a646757a7faa620f
font_01_sfnt_off0000c800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 14272 bytes
SHA-256: 8db407f6b6f4aadc9bf086116a7d1bd2f4eed97dacaac298b854a6fb651cdce4

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