Malicious PDF — malware analysis report

Static analysis result for SHA-256 990eb9d64125d946…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 00:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e55621f3343062bd0198ea9e8bb1cb74 SHA-1: ab5f3d8d7d1b37c512b4e517f962b255d80d53ab SHA-256: 990eb9d64125d946114b858dc4e81ffbb0c7f346922f981328d4bc02b793eb4c
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://teraval.cz/res/file/jogujoporeruwomenizawu.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac0b1f3f2---rofesixuwuxawenemufew.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/dofirobedapirajorunato.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/60666257898.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/db7d792796610ecb5ac99353ce68a305/85793028752.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb1a632c0c---49608744880.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/55196839911.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a735767147b---piwerabazumazitubeg.pdfIn PDF document text
    • http://artospace.com/pics/file/28519603793.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/32403062980.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/kf1lo8i0d0vlq59jqh0n6a1bj3/ritinadetapuvabu.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/61012349928.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611de2fd132f9---50265110440.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/25685402293.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c22982a6d2c0ff42c3fc5a57d5559dac/vasulabisozebesuwosor.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c86c7eea0---kusozifibuxekasujoxep.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/jubajujipegakawiguwuke.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/78140617280.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/10142262479.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/055a69621b214243ff00094f2b775662/toditogigomuwanomujo.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///23874966901.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/putelupukowunebinav.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aff50014d2e---gosalisikam.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/pirulurekorosasitokud.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/7f67af4848b50dab01414c357f9bf12c/xipeb.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/33895704327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=arti+stay+with+me+my+dearPDF 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_off0000d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 21808 bytes
SHA-256: 1cf4caae497536c2f4cbab51e984ebb74ee4aa73500afbe436fb26623ea1af14
font_01_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 10424 bytes
SHA-256: a75e88bcce98abef5b873542be9b7e2de03fbc2c43d478aafd2e08d00a970bcc
font_02_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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