Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbd0e480569a63a…

MALICIOUS

PDF

89.9 KB Created: 2021-06-30 10:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5bf21b820534bb908b7d0096bbb3116a SHA-1: 076d512cc0f59fd7a243e870ac92b27ae813ec38 SHA-256: 6cbd0e480569a63a5ebfd12c7079cfcb4c602202b4b9e937ff195dddc384aa2a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://okmarin.ru/userfiles/file/83241572273.pdf In PDF document text
    • https://soudurelausiere.ca/upload/editor/file/1504716665.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/789bb98874f633fab127bdce72023c52/luzojeg.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/5994137421.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1ab797e7a8bbf1e7439bfd950a383965/75646211585.pdfIn PDF document text
    • http://flomojapan.com/upload/files/ginavedopuposexite.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3dad6631---lemowur.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/56848304796.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/34820358920.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/08a2684cef3627b65434438a847efc41/4503988464.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/78026627019.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c06b5d570d0---313159095.pdfIn PDF document text
    • https://webmenuplus.com/images/file/13258056221.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3edaa04c---90940289950.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/e2dm0n8sg32q9td32ibuttajh2/pupasazubezop.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/jugozizarefi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rb0vvqoh9ge9lrjiua07nag3e7/matubafovu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c564f4239---rumerizukuwituviburilam.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/biruxefakofazowimapo.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/genirijebafukuti.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/96326096550.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/209100615460c9cc62204a6.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/17391634889.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a36b986524cf4687894b9bc0b21e1709/53225288811.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b64abcddb---morit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=workout+for+tall+guysPDF 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_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 17240 bytes
SHA-256: 817f45603f7fca1e3ba120b927b64bce2bf27f6d1a03505ef4411aa494c29798
font_01_sfnt_off00012aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA8 10360 bytes
SHA-256: 337ea7942d98ad7e7034c05b04fc42585955f707a98f7cec5ab98bef3c724c1a
font_02_sfnt_off00014251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1