Malicious PDF — malware analysis report

Static analysis result for SHA-256 5554292f4a343dfb…

MALICIOUS

PDF

70.4 KB Created: 2021-09-07 03:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f19a35bf93e5caffd3d633587ae9733 SHA-1: 7e1575bb0c4acc8db46c5255a301a7f7956bcc98 SHA-256: 5554292f4a343dfb9a0b87faa4c2c546b75ea8cc79dc5a9ff1f95ef00b50c909
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a link farm pointing to multiple external domains, some of which are hosted on compromised CMS uploads. The ML classifier also strongly indicated maliciousness. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://otoozevran.com/resimler/files/40348451925.pdf In PDF document text
    • http://kaies.net/upfiles/210718012650157243rgfx9i.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/3h888ib7cg317ualgrv0ikmdri/96643186699.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/16437823778.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/jafaradedew.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7be5446dde75af00542c1f859c220d07/51388748482.pdfIn PDF document text
    • http://zae.me/datafiles/file/42205791489.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/lebewugatobojogij.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/venasunemedizulefadavum.pdfIn PDF document text
    • http://live-net.it/file/61421286224.pdfIn PDF document text
    • http://springbook.no/files/tatupojexukegawutivozok.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/le5en07llc0hsheo221kr0gln2/viruwosofumamazogezo.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/58f4704ee7b63d77635b8080b84a8729/powanojajibatumaleg.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/51303597860.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/88367740105.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/0b2a2133a16d345361e1a1d3d3e6a466/vixibutuxukabisexa.pdfIn PDF document text
    • http://cvsc.co/userfiles/file/fizegusogajadugenapoba.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/31439258038.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/14143643494.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/556c74c755dd76f64b9b3be20145024f/suvuxamakajojasox.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e28984ee2f---moxibuxebenod.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/fomuxanebopupe.pdfIn PDF document text
    • https://tangentemag.com/img/file/61962730397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hydraulic+lift+principle+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_off0000b485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB485 10532 bytes
SHA-256: 22c3c767e91302104d6e0a3ac82d5bc2f8d8aaec82a2b0e9646f1b1f48684747
font_01_sfnt_off0000cc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 15620 bytes
SHA-256: 0b5e66f7540018fd2887013026d544abeaeb7bf32d8aff98629b60efd0d3065f
font_02_sfnt_off0000f3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1