Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73284fcccfaeb7b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 16:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5f6801daa6a3727ae2e10965dade237 SHA-1: 5b7da6d0accb19aa128e7601cdd9a3bc40cd238c SHA-256: a73284fcccfaeb7b8df02a639fa9209234d18fe5e6406ef6413ed4ac0a7b01f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains embedded JavaScript and numerous URLs, many of which point to potentially compromised or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript is likely used to facilitate redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://motelandratecuci.ro/userfiles/file/fugorofoxevowop.pdf In PDF document text
    • https://projetovm.com/uploads/files/gigomiv.pdfIn PDF document text
    • https://cristalensi.com/public/File/zekafo.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/wilogojowetadonanajagi.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/61695228712.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351176cf6af---91718606306.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/99446614266.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/lipegenuguxasijeribesuga.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a55e6c978b2815e946fade71d1d84c24/17300006898.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/desifovojavufok.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/sofitigiduvuzabexot.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/kupupewebilibu.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/9487566584.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/revomogojuno.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/34189584823.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16147e7902ceb0---21110090256.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/wesowagabowosa.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/45840682771.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/90429235600.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109200450113312.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/29974028201.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/14617359740.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/jejipunifudubekoromojet.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109030814158354.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/48078822140.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/60066422525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=import+favorites+to+chrome+from+folderPDF 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_off0000b5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E3 10800 bytes
SHA-256: 903ecab79f39be378ca4c5dd3200498f69c8f4b6f25136acc9ce06edcd2d6ffb
font_01_sfnt_off0000cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC8 16948 bytes
SHA-256: ca4faaf032bbb42565405daba3fba462be977e45804ba6cf049cfd7be9716a5c
font_02_sfnt_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1