Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c82fc75171ff8df…

MALICIOUS

PDF

85.7 KB Created: 2021-07-16 04:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7946363aba51e42ec59308ca39a181a1 SHA-1: 6a31ca6271f30c83094d7c49b1dfde146ff8d7eb SHA-256: 8c82fc75171ff8df3860a6801a14d085707b2d32f2811a63e765d8842cf358cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS upload storage and disposable hosting. These links are structured as a link farm, suggesting an attempt to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/906cd2510c57edcaa164d218a906906c/56025452133.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/70070675354.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/libowanasekatutom.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5753127c---wawawetiluzawanab.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0003097ceb---legegedapiwutit.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/82257143361.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/suturuvokemepogiwis.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61459ca263---guzixosiredimuzozawexogeb.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/waxerokuviju.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/nuesl8gc42g23m2rnlnkhtenng/13197465345.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/fopafatokozidemavomagidu.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/pozizanipewojewa.pdfIn PDF document text
    • http://gsoutreach.net/clients/e/ea/ea4f28bd0b090870cbed8536b6d1d406/File/vivorasosipuzi.pdfIn PDF document text
    • http://cortabellanews.com/userimages/fijusiwipekuvonilivovi.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/nufemot.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0295afbb1b40ee22d4699ce71f0e30ee/sexovunurunefu.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/47322209520.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/nebawadefixuzif.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d7921e9d023---22781483065.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021070207291573499.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/92861690405.pdfIn PDF document text
    • http://www.asslar.de/downloads/67438225719.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5a44f237a7500b363e6b3806d4064ba7/sopadatefepalidip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+many+calories+does+a+14+year+old+female+needPDF 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_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 16808 bytes
SHA-256: 279808dc228ec86268814afc4192cfae48365bf3f5fe8f6bc9ccbb6e9b500c10
font_01_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 10860 bytes
SHA-256: ee687fdae418ac9ea6eb80af9c1b21ea959138afa77a4b43804eb2a9863ccb89
font_02_sfnt_off000130ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1