Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39856f8d1baf2a6…

MALICIOUS

PDF

92.7 KB Created: 2021-08-07 04:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ebde9cdad64a2eaff6ce6804cabcbca6 SHA-1: 54a6485de18d1dcfda0c1e5b11259eec026f872d SHA-256: f39856f8d1baf2a682f9e909da78cc6757b9bf32f608a9493d9bf50a119e9c5c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on potentially compromised or disposable hosting reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a0cd8b91dc759afc0de68f241ed4658c/ninemojopu.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/94477297010.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/19hngs2in9758gl57apbbvac25/pavenakatujezowetesito.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f99cda03c---navosabolofapuwivo.pdfIn PDF document text
    • http://nfc.soo.jp/file/39634703968.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/300022498615.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a0d7c0d2---29398027904.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d68b457b9---18141796007.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/fevalinubixipodozawo.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f6ebd867c400a4f4e405f8285d81cb7d/vovivodedekizu.pdfIn PDF document text
    • https://mashura.co/userfiles/files/1064175128.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/22jivvm84o9lb16vj199g57c81/pufegesijamurukalisox.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/83927120550.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/909b94674cc648cad2ec7439f8ce08f9/sakabazeniwo.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/20950908142.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/89773442397.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/80728999740.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/77944269613.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/xovakupebovegiruxipak.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/3cc881990e66ca7cd4c72bd80fea3056/zotakuju.pdfIn PDF document text
    • http://nfc.soo.jp/file/dujugivoguruto.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a3ef1e45dcb01c46f18d0dccf0b26b63/patubaxubetumubu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083f3ec2fc9b---gonotulafexanuzek.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/61430325454.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/76434221115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+last+policeman+book+seriesPDF 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_off0001023e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 18056 bytes
SHA-256: 00e394c5df27706939123dc6b70f8d5b518c9e1d73e1fe383ba78e910a405a8b
font_01_sfnt_off000131cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CF 10836 bytes
SHA-256: 9ef6b5cbd5631931d6114726ed8e2380548a46b429276143ce23f97c7a2fa70d
font_02_sfnt_off00014a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1