Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a7419d40da904e…

MALICIOUS

PDF

79.6 KB Created: 2021-07-26 23:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b17fc22e118649aa4d2fa189adbccba1 SHA-1: 1c145814c4ae2190e0eabd94f0b18e92c2871613 SHA-256: f0a7419d40da904e132e55838b2571a22ce71f187af8d0eeef7285d71fe778f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. Although no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users to malicious sites, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6876751757---betapuga.pdf In PDF document text
    • https://jiu-hang.com/upfiles/editor/files/4377988581.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/naral.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/69753104672.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771211c6b02---vuxasosejizefumolijuza.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160805d314754f---36626996308.pdfIn PDF document text
    • https://brod-plovdiv.com/images/97675287039.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/pemutijewirarenimatisov.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/wuwanilunizuvitibefoliko.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b020c412c6f---66207092116.pdfIn PDF document text
    • http://0930actress.com/files/files/529851849.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/83994620564.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/gositolobipetoxawofigi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a5n3joeb74td0o2ansf8dv1d17/47276524178.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/44718905517.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/73466573127.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/1512411830.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7669cc5b9---21582871031.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/42f58ea2809c452c217ae7583437df8a/20714103220.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/jlrk736ggp6747p170jp7vvav7/92206975385.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/navon.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/0pltv1fp71fn4garlev8hjnlm1/sepekik.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ba0de8e7d90f6c2feea62b339683318a/lesedodosikonaranew.pdfIn PDF document text
    • http://0930actress.com/files/files/galosidupurokuwaros.pdfIn PDF document text
    • https://ms02bet.com/contents//files/xojeranaligijuxexukelaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=finding+fractions+on+a+number+line+worksheet+3rd+gradePDF 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_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 16576 bytes
SHA-256: 86c5dedfe56d03fe1d708b84ca9ce8967fc387523ee837a410c1252ba4b6e6fc
font_01_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 11488 bytes
SHA-256: 56ab53f9b5287c357ea047a77b5a484dabe2739f34cb4e32745d2451d1b891e7

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