Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bb4bdef84aa2b2…

MALICIOUS

PDF

89.6 KB Created: 2021-08-09 02:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc32085435a3d4a194e91c7c7b8dd11b SHA-1: 268d41967dae12cba92232be30a9487122d413b7 SHA-256: 39bb4bdef84aa2b260bf67484f876d2f0528317a06d0aa78f41d7039df746b45
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a raw IP address and others hosted on compromised CMS upload storage, suggesting it acts as a lure to external malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/jegorekavajo.pdf In PDF document text
    • https://samavetpharm.com/userfiles/files/24228183017.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c3ef4c9d4---zoluzovaxadukonebaki.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/35069298588.pdfPDF link annotation
    • http://www.tekkoo.net/images/library/File/mopatararinafokususoxupa.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1ed291a190b86116acec6be2b4ae8471/lesowow.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/27bbceddb6d7360b930bd707f59f258a/novadejizezujujebimov.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/586cf6944080d1c8f0c1297721615274/22110469845.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/71675779442.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/savawibifojiwix.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e044581b43---36846299915.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/10166070117.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/16177163389.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7f522bf199f3f61a6b5333ab2d29f6a0/jamosebuwu.pdfIn PDF document text
    • https://gangnampools.com/contents//files/rabinozovofusijukoxix.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/bupukiretojumeliwezexuf.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/vubozadojuvolizararipupa.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160879cec23b6b---55326698344.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/eb5b4a0d6baad629048c0d1f8c3463e1/retelopetumadivofovusebi.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/51253382689.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8b7ee7648f031e4ba0493addcb2bd495/68892958335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+meaning+of+life+bible+versePDF 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_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 17896 bytes
SHA-256: 9153d01d254054528ec6bc6c471001e12666f6a614faf3d941d476d369bf1928
font_01_sfnt_off000125ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC2 10860 bytes
SHA-256: 69790a6250a94fe84fac1c2e20ec07e657bcb0705175ea6eb9bc0b91fd515208

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