Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c10cfc5ad62cade…

MALICIOUS

PDF

75.2 KB Created: 2021-09-10 05:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 35fb549810fec5d0fa7d876f51cfd71f SHA-1: 9b4c157120d13858cfca9a5e9de50b946157ff43 SHA-256: 0c10cfc5ad62cade407866455f59af6ad8c869eacbf5fdcd2f0982cd919fb150
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.bongbansaigon.com/uploads/files/5093956943.pdf In PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef64acf51---zelofidilibalaja.pdfIn PDF document text
    • http://kleiberit.ru/files/file/72646205979.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/nifobogexit.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/xatopesixuvaxija.pdfIn PDF document text
    • https://cmf8.ir/data/file/89492654038.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca22c2431---97981226924.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb5039822---75712544072.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac0996de48---86955044043.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/boduxufiwevo.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/36144955582.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/xefizikakajeril.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/zoxikonesesarudevet.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/zetovavirovikebo.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210903201812134.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/nuxujifilodexokoxe.pdfIn PDF document text
    • http://stroi-sistema.ru/img/lojixaparifegavatov.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/88091565449.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/komerakofame.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/308675464.pdfIn PDF document text
    • https://premiersuli.hu/files/files/suziwolomurufijisi.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/43489962794.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/60952265376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=learn+data+entry+in+excel+pdfPDF 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_off0000c20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20A 10500 bytes
SHA-256: e818d9ee1641b029392eb7aa967534051a40cacaaa26fc75b05054e621ae0c24
font_01_sfnt_off0000da06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 17944 bytes
SHA-256: b254983cc91d2d6514e79824a0fd66750d84497152489e73b68518d4fa4b096b
font_02_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1