Malicious PDF — malware analysis report

Static analysis result for SHA-256 b390f54fee341c2f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 12:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b7a5f5caee1d5e7fc5acfe7e5adf580 SHA-1: c2b16247bdca8a5f3d924476f75df520392f1d3a SHA-256: b390f54fee341c2f1e4c5550830531e0029822f98a9cb23434395e22d9e273bc
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nepalmicrofinancesummit.org/userfiles/files/semunibanoputere.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/25237947684.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/xupojuri.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/73004055943.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6d408f920295577486c30b6359031c89/54866855675.pdfIn PDF document text
    • http://budka39.ru/files/59079006308.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/denofux.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/56928949585.pdfIn PDF document text
    • https://masukpt1.com/contents/files/7942931170.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/32097048624.pdfIn PDF document text
    • http://potlista.com/file/files/rixizazemipivojuzizep.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/51973867074.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/surirerapejafolapu.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/47776812849.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/5325416476.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/pajupabis.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/9033308743.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/40594280815.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/lpgu20b8tkhj66t9hkamd0utpn/gatotitokuzofomis.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613871ea826d2---38471031378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+hangouts+updatePDF 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_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 10708 bytes
SHA-256: a22f1f2f9143a737602dffc43f4009844dc86284091edf2ab2175f0f7aa405bb
font_01_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 18688 bytes
SHA-256: b3637b4168cb923d1a4a139e5629575c3f57d09f4785ef1f3998800b6855fe55