Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee605bfcb873226…

MALICIOUS

PDF

82.4 KB Created: 2021-08-21 00:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d67a3fd80f8c6a4b24ebe93284e67b37 SHA-1: fa03957ee9468917eb1918ac710d14565f110e64 SHA-256: 4ee605bfcb873226d5d939e07c644613434d74915c1c2fecc7ebac905d7d92fd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://iphonerepairservice.nl/app/webroot/files/userfiles/files/lelenodidovedudi.pdf In PDF document text
    • https://hinodanang.com/uploads/image/files/lolinif.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/buzafadokumusefosakabof.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/bobabowogor.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c017e91a8---90519186324.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/jfukur4scfc8rpsrfrchlqv9p8/pelovedibelipigevul.pdfIn PDF document text
    • http://fgosvo.ru/files/files/zideteru.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160be0c379a529---wapoto.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f163a358f15f2d93abbdaa21601bc300/wegugolenogifilivuwawaj.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/lejikowenaviti.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ol6hkss2auu0q0gbie7vtiagf6/wilumimusomajikujo.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/66818950191.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce16f73063---debofubajegerogidubixux.pdfIn PDF document text
    • https://rinducm1.com/contents//files/17030978301.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/h86ug5kevedjh6hv98eg2gc8ra/42077435933.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/415b32b12a879ac98c77d0d9d50a1ebe/digubuwuvelo.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/nobesiporuxove.pdfIn PDF document text
    • https://suksesunited.com/contents//files/95739183483.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/mozujipatimelutitesiwos.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/79541766201.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/misulobebuf.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/946d14600be8acf4aae526c4164332ba/70413051328.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/677ede2d64ced6dfb5182d23aff6d5ac/pumasomebobubaxoluzifi.pdfIn PDF document text
    • http://acril.ru/ufiles/files/xaboxironi.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/febomibapuxalumomemop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=candy+crush+soda+saga+mod+apk+unlimited+gold+bars+and+livesPDF 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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 11504 bytes
SHA-256: 656d594eaab05b7e7e50c5d45f3cb954ccdfbb2dd0ba9b702b5e52129a1304bb
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 16548 bytes
SHA-256: e7b602b6439baf42500b3b2f7587a4c37b83538d1f430843abf415e8153acd1a
font_02_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1