Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c33194d2a03d6f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 07:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9707eefab1047dd7ad834a5b1e3d527f SHA-1: 4336fc815660b0ac79f5da22f13e496c61b92ed7 SHA-256: c3c33194d2a03d6f5d5ea85b7cdc6ae438c7caefa1f1396ea78933063b183044
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b4f7d769---leziporanobiforawufufip.pdf, are likely intended to host malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mega.kz/media/upload/files/85428622839.pdf In PDF document text
    • http://jfhconsultancy.nl/userfiles/files/lamubefefisofer.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/bilugokogogitovus.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/9005057273.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/lifuvarobeta.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/lemalataso.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/80389055983.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d6f233891---sosotivewufaf.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b4f7d769---leziporanobiforawufufip.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/42416072841.pdfIn PDF document text
    • https://rajakedua.com/contents/files/97797759568.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/99765122333.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/poxuluvavozapew.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/nilapefofuxirozutas.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614139f17a336---80579024100.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/39538180995.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/gogorefirojuwuvo.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/puriwazowenuwi.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/zoxubajojepuminudim.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/49992294693.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/budewapixakazozoxaz.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/taguxekoxunesanugu.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/86996156990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=photo+editor+with+background+eraserPDF 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_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 17484 bytes
SHA-256: f1506b4daf900c8311b91a015505550a5942d32dc8c2ec9f88f34604255c2d4d
font_02_sfnt_off00011da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA2 11020 bytes
SHA-256: 14872efb2dd526870e9bc1ec012784de206f81ec26c0ffe087f54dc660c196c6