Malicious PDF — malware analysis report

Static analysis result for SHA-256 eabc3e04b1f92aaf…

MALICIOUS

PDF

98.9 KB Created: 2021-09-17 01:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c93c7209261e9cea4d3e944bc51454ab SHA-1: f13d1b32a05080789d9b43fb5c47b4e08c2b2300 SHA-256: eabc3e04b1f92aaf7b020e6c32e48f3e4c3ce6daa1a5139c260149fc2423ee0c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs, while numerous, do not provide a clear second-stage payload, but the overall structure points towards malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://fleseriuassociates.ro/files/file/79079786172.pdf In PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/purisudonogorepivozafes.pdfIn PDF document text
    • http://askaudit.ru/price/34811700182.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/68345027639.pdfIn PDF document text
    • http://yztools.com/images/upload/File/ruxaku.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/55090280840.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/11839583776.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/76531586780.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/78284732680.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210916033841_1054750367.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/lalikoxuluzebazesixako.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/mesamabezo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f901df2800---kunaxofereveka.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/vorop.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613081b1a62fe---texokosiw.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/noviwitewetijemakafuloxi.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210908_075711.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/98340353793.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/63168234027.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/87049832292.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/54856212873.pdfIn PDF document text
    • https://adikketiga.com/contents/files/44240774412.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8cc3702d910cd5eebad971e2c7a96bc/50444866854.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/95188082455.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/purepuwusufatulufit.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34905712875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=develop+java+applications+for+androidPDF 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_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 10812 bytes
SHA-256: 0aafbfd3dc609ed5708818ecce9516f71eca4d5730bcb1e0a779eddeb8ad1d20
font_01_sfnt_off000134ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FF 18652 bytes
SHA-256: 07eea937007611cc3b7981efdc2a4950babcf69709b4c52184420c9d413911f0
font_02_sfnt_off0001654d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1654D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1