Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58944a3fefd035b…

MALICIOUS

PDF

89.0 KB Created: 2021-09-02 07:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ed9de40d7b504b244c8dbb86e075669 SHA-1: 89cd5e0f3983840eeadcebb06851cf93a78a59db SHA-256: b58944a3fefd035b438448f4855267ecf826e51177ed4eedcc12fb03dadd0525
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21c0d3d6c4---86279279990.pdf In PDF document text
    • https://abofahed.com/userfiles/file/netekutukenu.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/37796505896.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/pc6nkbjab9a2v6gltlhd9p79k0/gizenuka.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/rubodulizimelimiwit.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160945fed03280---19714401257.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/70104936292.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/lizubulizezewi.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f595242a3b4709344d978789d86a9dbb/rozefakekovipomolite.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/pobotolodozijav.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/63294298318.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf832b3bc6---kisisemuwaj.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/71317047257.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/zabukopi.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/xunalevenekibixozubub.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/89053346181.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/pupobagifomasusoror.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/52540156780.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/ec2888c73885bc33ca9aae94e75b24c3/85192623580.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/25293646982.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/69790905440.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/e6on92b5ece6aii8u0ckqi9f02/40417130032.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/kinetizexi.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/58711356683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=napoleon+total+war+strategyPDF 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_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 19152 bytes
SHA-256: 3946a3e4014d4ff891ec50eef9faff16321c3ed4fe46d0363edfb5718894326b
font_01_sfnt_off000125ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FF 10512 bytes
SHA-256: ed3738cfb871b209f937fc35abdd70d4d038db800185b8485cb85455ac8f25bc
font_02_sfnt_off00013e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1