Malicious PDF — malware analysis report

Static analysis result for SHA-256 742c64f4e252f46e…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 16:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32c591b07e0f8fea84e0193c15d7fc25 SHA-1: e4f0b5612a2561d9748295d9b74739bfc407e632 SHA-256: 742c64f4e252f46ea09c42da4def044b1d794be5d3ca470971c45d1c579eb1c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains numerous links, many of which point to compromised WordPress sites hosting other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF acts as a lure, directing users to malicious content hosted on compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f2267006---rupejubenojeketowus.pdf In PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/laxedikubojifepinuwojuv.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/15502548136.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/visogorakujesu.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/kenejusupebiteju.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/42899529638.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/butumenagitifimudedasonig.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/9606171129.pdfIn PDF document text
    • https://maclashoes.it/file/wufunemefavoget.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22422db772---zisijitakoju.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba89ee4c2ab---vutonajezefesojokaralugo.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/sejekiviborupaleboliwades.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdf986163---sunuzibole.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/15101edc803a8703453f5448742344af/lozazovivanaxevizebuvo.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/88010313736.pdfIn PDF document text
    • https://armenia4d.com/contents//files/ximofimatidifape.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210606074703.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/19160509120.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/30553581639.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/14171741487.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/37927485320.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/65943651916.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/70558017142.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607995c2b2ad0---62757189580.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/vuwekigodinuzijop.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/34975156467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ssat+elementary+level+vocabulary+pdfPDF 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_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 11184 bytes
SHA-256: ba48ecca3c7ecbebcf2f67fc228ed3a4e9db9b7ad95add73383e81f6965e1540
font_02_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 18172 bytes
SHA-256: 332a4cb34106a8ee5da82c39850a452d8ffe2371917bf5f6ed38d7dbe9f2e95e

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