Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa84ee90c5a66441…

MALICIOUS

PDF

106.9 KB Created: 2021-07-02 08:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 973de8ba6b5d14de75977eab520f2d44 SHA-1: 928a7c78541e4780717f50ec01d7e469aeccbe6d SHA-256: fa84ee90c5a6644198bd38d806881e00409813c4c79606b8816e893a5de6d754
172 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 phishing and potential trojan threat. The heuristics reveal a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. Embedded JavaScript streams are also present, which could be used to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aaeabe3eb---bujefupubukiwilodavolugeb.pdf In PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/55206128663.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/4e01b47f04e0140011f7ede6bf6ed71d/dulil.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070aba14b1dc---kipumavuvesamafinon.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/wifojapabejiredumizo.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/53201210927.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zefugadirev.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/40552303369.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/xadevegumutimofekar.pdfIn PDF document text
    • http://envigest.cz/upload/file/44830931212.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094536664981---67885324417.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8905e24e09fa46935ae82c0a26b0b4fa/30769989378.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/169ac4734df3068282e3f1f2489f3878/bofilepituri.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/82629060311.pdfIn PDF document text
    • http://ashioke.com/images/library/File/62150454880.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/65485842902.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/744370.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d104b7fdb---7506010722.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2afd2de0c---muvuxiwupuzerirozejubuz.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c014a3ef5dd6ffbe3c1bb429e28d2bec/vumigititovafiruwuf.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd870c9255---92267047513.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5889b324ce---1079539961.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c72ec454f---26626572002.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/fuwixalepoxagewizenafadup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=forza+horizon+3+android+without+verificationPDF 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
stream_004_off00015248.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15248 27616 bytes
SHA-256: 9776cca0bd938000b429c90347bae7b13058085434e57675aa90eb3f96aa26d1
font_00_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 10820 bytes
SHA-256: 3b12461f3f8b2daa7beb98d22fbc31249be0b603b2fdf440724ade5b668ef129
font_01_sfnt_off00012372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12372 17840 bytes
SHA-256: 5c7ad03a0b98eeb8765ef037048c7c276c63504bc5263cbd7233ebf570a59439
font_03_sfnt_off000183eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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