Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6958f5120db4d0b…

MALICIOUS

PDF

148.4 KB Created: 2021-06-26 21:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9097c50b1d11ac323288f89dba4f6a85 SHA-1: a5fb1b3e8678d70bae537d47cc9b2c447fa1efef SHA-256: f6958f5120db4d0b34b74b2febb37c8a02ee394f0bf8c804d22c29ed79fb4967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. No scripts were extracted, but the heuristic firings suggest the primary attack pattern is a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://www.awakohchang.com/image/upload/File/utumewazotujopovepeduku.pdf In PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/31940098335.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/221643121004.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920fd770358---84061315082.pdfIn PDF document text
    • https://ckmandarin.com/uploads/83144306515.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16083c7e37cae0---20270278448.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a422168018a---putezezuzapududug.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8d3caf5d9e2be0f52975460ee9b96a2/bazalutewepevun.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/04cc09a43bfe065fad0285a78557082d/wesukufimef.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b40114e340c---xagur.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/156829af593319d756538e2a0c014a09/pasupurano.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/janotarelu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078089489098---20340422201.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac061d18078---pifelozafaverixav.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833a05ea0b---watobeketazumiwadalil.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d1395b0ba7a6814046a23c0900ef9357/wujetibo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8dd352686da4b76566b00e9e70e37b12/zatozufazibalajegenu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/23iro6qmr4edt11ie8gvhk6tcc/26478575739.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/95150338607.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0ef203a4d---65270360020.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/63f3ee471f59bfb24b3b4f4f37522137/55756055933.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/89893199334.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb7e45ac9---zupavefekokutilupurof.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/95152892040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=s+chand+physics+class+10+electricity+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C792 19136 bytes
SHA-256: 5d99c65dd315a9a484120279be4f9f33e26dd4fdc26c2c5abbe638082b7e4a7a
font_01_sfnt_off0001f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000211ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x211EC 11164 bytes
SHA-256: 609a7b5b2d1052431792851f80153b98b0a527faf025b65da5ed97c54fd7feb0
font_03_sfnt_off00022c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C06 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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