Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c7f77776b91fff…

MALICIOUS

PDF

94.1 KB Created: 2021-09-12 13:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0b45756d4b245451a71b8f09927a07c SHA-1: 523968b7688e180d1db454d8b38360def03e50dc SHA-256: 35c7f77776b91fffd1c32e5ea9c264ec22f7291767f69f911aee2cc5b905f822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI and link farm heuristics indicates the primary purpose is to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://coretry.ru/uplcv?utm_term=the+first+48+123movies PDF link annotation
    • http://sevvalturizm.com/rsm/files/pabixumejo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c5b4c3d78---tutomorunepebilabegid.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/lejupelosus.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/vozuvov.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/jasenibefazudorup.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tixuzezo.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/67744167363.pdfIn PDF document text
    • http://thongthien.vn/upload/files/27174928533.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/87000649988.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/bewumulole.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/21625035007.pdfIn PDF document text
    • https://pepsima.biz/files/file/15982231849.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/sufowoza.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/wodon.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/86648920080.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/1cf8d436ca525a6db434ed84c7b3ae33/mizojoxeg.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/zetejatukorefiguvugolina.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/70547661722.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/90192891568.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/64756264978.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c14fd38894---63742797136.pdfIn PDF document text
    • http://mfcpavpos.ru/file/4372091139.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/22563756834.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/76962410430.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/fovurifidimunidomeguned.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/betubazowo.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161335ab280a8d---daberesilodalibegoraret.pdfIn PDF document text
    • 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_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 10828 bytes
SHA-256: cee66be2c2259276fc69a2a43af62b32c7bc13620f13cdfc19027c3c4dadcebd
font_01_sfnt_off00011e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13687 19624 bytes
SHA-256: 5b1f5942833f00626dd07b74c28249d6a89993340104cf275c9445751997aaea