Malicious PDF — malware analysis report

Static analysis result for SHA-256 c857c7dfcf1cf512…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 22:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c07b6c5b0ac54d6fe056f3782a1b2cc SHA-1: a95e01c954e9ed4abdde7146aed46a65bb289c09 SHA-256: c857c7dfcf1cf51280965b7cdbeb3c5e00dd93a8680f91edca081e25da799fa8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple links and the nature of the hosting suggest an attempt to lure users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://khogiaydantuonghanquoc.com/images/news/file/19470700297.pdf In PDF document text
    • http://ediljolli.com/userfiles/files/kadibovuna.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/muzojirogivudililuposof.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/juwexibedolugu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e0d9bbc37cc04b84f2277c51761bface/pokatajituxodarutawode.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/6782260599.pdfIn PDF document text
    • http://kidneystonetreatment.in/userfiles/files/11898794710.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/24u0g8af3pi2h3q83mnkclpm41/tumamagidebiko.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f64510c0a3---28284038699.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210915150056.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161378d7e5adeb---motijafov.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/48183235701.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/woxer.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/148f468c8ea8e16a51e33fa6de069dfa/88701030013.pdfIn PDF document text
    • http://bjjiffy.com/upload/58717352150.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/87798002537.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/76719480974.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17179430887.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/9182432060.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/3i7953jbmfenkh8eqlr0696k32/858954094.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/30986157235.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c1a13e34894f6346f548e1cd77df2414/46802224440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=a+quiet+place+part+2+online+watchPDF 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_off0000c4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 17956 bytes
SHA-256: aa4d7cc228f6bc0b6559ee6e5de0d7a46dbff761a4877b7fab22a49734b39ff3
font_02_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 10736 bytes
SHA-256: 389a7a695682e9e7d56deb4baff5467eb7460413fb01568ed0e44bba8fa44145

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