Malicious PDF — malware analysis report

Static analysis result for SHA-256 c596d3db3efa6dc5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 21:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e79f9c2efee26fc29c1b13d59ac135a SHA-1: 297ef5b9919048203721abe50b67534f5a3202bb SHA-256: c596d3db3efa6dc54fa245764a6117576cf6c594973cff7fc671de1d945322b5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=time+worksheets+for+1st+grade
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/fca64ec805e138250d339ccf1ba777be/36613696400.pdf
    • http://animalscipublisher.com/files/upfiles/file/kegirujedabigakobip.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rovpnpvrni5g6du5gpknd1ngg8/4149713383.pdf
    • https://ratsimae.ee/media/contents/file/jipowivatakone.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abddcd6899d---83560652261.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077e6c14c5e0---90467253245.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/7b0d31d44103b8d8f771955718c2f3e4/wijelazo.pdf
    • http://kstarsmall.net/userfiles/file///81779587216.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021510055299349.pdf
    • http://fruitsad.pl/images/file/kewubikavufo.pdf
    • http://risme.vn/files/81829446791.pdf
    • https://menlopark.com/wysiwygfiles/file/69523728800.pdf
    • http://www.iece.in/userfiles/file/86940864319.pdf
    • http://www.cerathai.com/image/upload/File/63934070238.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/omkbjoekcquj01e50e6aimvrh0/vovevegogemixaxakudev.pdf
    • http://czdashan.cn/uploadfile/file/2021052719425273499.pdf
    • https://anhhuynoithat.com/asset/files/51386371842.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3fd79118f---mopapukinaz.pdf
    • http://duoctruongxuan.vn/userfiles/image/file/56050959764.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/56a60d2405c5131cd03dc23258d3aae5/pinilebabeviwod.pdf
    • http://biosurfest.com/userfiles/files/28274330529.pdf
    • http://sp3siemianowice.pl/userFiles/files/xilateluwixalakipuzo.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f135ea0133---98230517694.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/566fb6d00d42a7b6694897ca1322ab20/46246607495.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5bf884b576860c623aee5340de5b6bd8/wibodemogolakudanod.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_off0000dae6.bin
fffd443869fd6484a9affcaae3621ccc8104a9c4ed2c92830255561ca5aeb624
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 10844 bytes
font_01_sfnt_off0000f3eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 16792 bytes
font_02_sfnt_off00010bfd.bin
97d32e424b51b5bbef4daf6d7a6481c29566770a63d9ef292260cab5213d87bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 16988 bytes