Malicious PDF — malware analysis report

Static analysis result for SHA-256 45226c236925c4bb…

MALICIOUS

PDF

93.9 KB Created: 2021-07-13 17:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: dfc053ca238af48eee3f77c3e4eb0413 SHA-1: 0589aedf5caf2d36caac9c8869633f29a457b816 SHA-256: 45226c236925c4bb16d70f89bab5cd952b84f3c5324d721fafc6b9ea80af5a2f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed7acfacb69---medomisavetotigozena.pdf In PDF document text
    • https://cape-electronics.com/media/file/29541227015.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/punak.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609844c7c0125---pezefubidorozunefajitumi.pdfIn PDF document text
    • https://adikketiga.com/contents//files/52716142229.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/g3nt2diulr5prqo3rs0c4mhfd9/96002946724.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e33de2694---35922853584.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210706_820871E66E5FB5FE.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c864a58a9e4---46434708094.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7d96a812d1d0e1387ffb9fdc59c4c5fa/5203420990.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/juzakavexaxa.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d833b44c1f---xozobubimonujow.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/971ab1f0fbe3be7cbfb3bce93bbf1c27/jawuj.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/eju3uov15rl0othlfqmla22qg8/95611571923.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160828e8b320fa---wezifudadagojefaxopij.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/wiluxukomevedazimepafirux.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/jgpr2lo32ioerap4rcsorrifof/35679789577.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/93710b5758919baf8fa31e2dd55fc7f0/suvujil.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6d98a764---devurimavaxodifiruf.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/62700266096.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/0650ffa189657d942fec60c3b85f74b3/marorax.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f3a44286a---zofufilodid.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/mafivuf.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/gu57qjdnt1b7ohli35a8g6ik1j/xepuwiguvu.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f08f95dcc2c5ae97d2d95f00044b1238/85637501591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=neck+started+hurting+all+of+a+suddenPDF 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_off00010ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 10924 bytes
SHA-256: 06bcfb16678787c245cd07ec35b14208cada655fa417354aa9a830eeb2be8e8f
font_01_sfnt_off000123d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEB 17028 bytes
SHA-256: 3eb98ef5b4115fc33b67bbd1e5ad6b9b8d0bb449be1abf3eb38af714f4162765