Malicious PDF — malware analysis report

Static analysis result for SHA-256 167658325e302af2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 10:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66b15c02a9ddbbeca0d8ec26bf421ffd SHA-1: 51c5e29220ae6e0c82ec8745d531e60147b0c022 SHA-256: 167658325e302af29c8f527482fb90367a36a3d04d86c707272ad780bdf227a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or SEO-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://bsbcarpet.com/userfiles/file/24440518633.pdf In PDF document text
    • https://egyptsuntours.com/userfiles/files/putip.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/jusudibovog.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/furilorofefurowi.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/96120661799.pdfIn PDF document text
    • https://ntc-container.com/upload/files/85636733409.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321c55680ce---65206512570.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210902120526.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/9499748602.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/limezafuworuboxijot.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f92a5a7886---motoruwexi.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/gevajagujiba.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/bidobiwoxok.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/90902865354.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qdunu73m8e9ol3rfk6ck9ijbk1/16021926581.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/nujutoxoruxikiwar.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/wabovuv.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/35972599553.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/lulixa.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/tesagi.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/miwokove.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/vibanulorevupipu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137457844b66---67425367076.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/vexumetozevab.pdfIn PDF document text
    • https://isleo.com/i_photos/file/17584947138.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/97319052388.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/tozibudalimisak.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370f69c52e5---30475393785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wheel+of+fortune+song+title+2+wordsPDF 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_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 18308 bytes
SHA-256: caab3dacc7981cd71de84ee3f4a0ff14ae5e1aa43885d25d9f8c7f5cb81778c9
font_02_sfnt_off0001270a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270A 10772 bytes
SHA-256: bcac49efe076c150b882786619d29d3a72d7df91bd35d545385872cd540323a4

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