Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf20b700523775c…

MALICIOUS

PDF

88.2 KB Created: 2021-09-05 12:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 825b6689d1e00fc02bcb5f214e8d3841 SHA-1: f7263abe06184f36a47950af1347488f16a5afbe SHA-256: ccf20b700523775c96a95d5043e43a04a4e0468c4118e081a4f48fefe7a4bff0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised Content Management Systems (CMS) or utilize disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/vusirarapupejasezepiminus.pdf
    • http://laduses.nl/image/file/jujomikujabuvosodox.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4093d01b5b---somojabob.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/sdham2ube96m0l6qsj4soh9fs0/jinejog.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/recthskoa4i0br376jnqboerb7/zukudowat.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160838475a0cec---15968604205.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f23a232b44---36665573615.pdf
    • https://zohopin.com/calisma2/files/uploads/bapekitogepepesanad.pdf
    • https://biovuspharma.net/userfiles/files/32883222021.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607860023af23---36150893072.pdf
    • https://samngaimarble.com/html_upload/file/42171342956.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e9666e3478d87342c3a90c08882050c3/milejowovisaz.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d5f84807---ganelareno.pdf
    • http://elma1.ru/!upload/files/jikasemewobe.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/930db03db0c9f0837b494e1446b09ad5/99462514291.pdf
    • http://maychamsocda.vn/images/userfiles/file/73655161004.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad9ecbbdd---98136785099.pdf
    • http://findusafranchise.com/files/files/20209764886.pdf
    • https://manenshop.com/upload/files/56438459847.pdf
    • http://tns-china.cn/editor_upload_image/file/sugukap.pdf
    • https://planet-pvc.com/upload/files/navazuxamajonatofegum.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/kinulebuzomawaso.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba514c45b---xutaxuzogeropifefigibe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=different+approaches+in+teaching+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f449.bin
123cfa14ba2e3d1375a3758c4420a4ce78784d60bf9e10f519081408ac894408
pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 10852 bytes
font_01_sfnt_off00010d12.bin
60e38cba3bdf2a501e73da71c74b2c4947f222dc4b203b80369b45c4b3a4dfea
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 17888 bytes
font_02_sfnt_off00013ad9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD9 16792 bytes