Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a121d412a1ba4a…

MALICIOUS

PDF

94.3 KB Created: 2021-06-26 13:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0656187a0ece45944402d01c0a3d603 SHA-1: d549f140c0d3cbbe102ae748200f12d69cd6c083 SHA-256: b1a121d412a1ba4abaf88aa3b5cb0b63386e7954e7531c614c70e848fbf31bf8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, designed to trick users into downloading further malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2b22513d934f4e2cec8f7dd6fe9bf2d9/26806318121.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/kt0el4ddeje4ttehokvc1sj3d0/fowugetidimezede.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbfae1b662---guzabarigafo.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58703b3b7---27751323385.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2245bb357---44629236206.pdf
    • http://china-engine.net/ckfinder/userfiles/files/46100470934.pdf
    • https://loctra.net/userfiles/file/37462032693.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/aef5e1c0933e301c52bae6fea4b66796/75538718302.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608be8255e49c---1867118698.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/n3hlkc2s1ftqo1l6a0cepf0m7j/fijinavopumatoxawifefuzi.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/0dql1vb3qnhspkb38pj6n281fj/64108840512.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5f47d5a54206405fa50732dc27c1ac74/lalisorisutizixed.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/k1godfnd43s1bispd31bpj5qd4/gajogemux.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/39321965099c5790d7f385142bb5ca95/737490904.pdf
    • https://banghenails.com/upload/file/ziguvax.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zobabedexo.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69bbae295---47511478449.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/53250356340.pdf
    • http://hoangnamjsc.com/upload/files/17981950794.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/1063b0f332ab5ef3ca8ee720168b4ad8/pirabafozad.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/c9f5a4e761723937a495ab7deebd7447/bozipijolovotefosarepuxu.pdf
    • http://www.cafeinca.com/img/public/contenido/file/sobaganejepazaxeneg.pdf
    • https://alshamiltrading.com/alshamilfiles/file/jatikubenazazuxeto.pdf
    • https://airshow-bg.com/file/86255442898.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/8e89b76d5162e46492280cddbb256c0f/pugoferogofomixobado.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=chef+interview+questions+and+answers+for+experienced
    • 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_off00010a71.bin
aa821a3da4a716954fca90f4dcc473d1404a030ac9ab9a5c2a2e3943b4418e6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A71 17636 bytes
font_01_sfnt_off000138e7.bin
60fbe6e523cfbdcea3e5c4e9f6806415380a129570e22cd4f9e0ddbd1c3e0aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138E7 11200 bytes
font_02_sfnt_off00015308.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15308 16792 bytes

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