Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6318711ee865c1…

MALICIOUS

PDF

186.9 KB Created: 2021-06-28 13:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 07ec9ee8cd51538b6e86c66d8775de60 SHA-1: beb1a6173847babc982b29e872d03e96b19ee01a SHA-256: 5a6318711ee865c11bcead749d1b53b46598c033e6d992475ef1d6200c09490e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on compromised websites. This structure suggests a link farm designed to lead users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9148

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://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607dadea1b5c5---meram.pdf In PDF document text
    • https://n-v-v.dk/userfiles/file/10862996079.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb42a0f591---fosifurasovopapif.pdfIn PDF document text
    • http://hopsch.de/uploads/file/3576489009.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c30dbca88---pabevekugilakejos.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090b7e687481---gezavidivulibabevig.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f028ef6a6a670c57fca0fdfc5ab543da/xiselogubulilaso.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/jonugidezikazujibakulu.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/bejufedererefulosejet.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/15954610268.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097c074d8436---40644389498.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160702befc70b3---80095188168.pdfIn PDF document text
    • http://quaint-house.com/11457220554.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/vuxap.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aa11445ab9e---vekosomezegofafoxapezes.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/45415698851.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/54e7110221adb6bd5f37b6fb329b8555/26540685977.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db955a1438---damado.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/r7508evbsh4hpnkvboq3tm006g/73453551688.pdfIn PDF document text
    • https://btegypt.com/file/fezigupugulamoletuvuzigo.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tuzutupabunulivisutu.pdfIn PDF document text
    • http://beiks.info/public/file/ruvogur.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/latefalevesezopavip.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806faf9cfab---78031300803.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/xudomademuzo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a230be9b31b---79426230920.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/46542dbf2b1608ffe84dcda9443cf20a/tinenigutisujazedisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=all+you+that+are+heavy+ladenPDF 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_off0002544b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2544B 30536 bytes
SHA-256: 5c62e35a467209b88667b58b0e75c50abff437bba8a316b6d64c2fea93e8a2ab
font_01_sfnt_off000295c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x295C0 10344 bytes
SHA-256: 885a7500eb588ba2ad358b6d3646648de3a7e300ed38af8e507b54aad79a16ee
font_02_sfnt_off0002ad23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002c534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C534 16688 bytes
SHA-256: 6ec450235821cbdd9ed474def1abee0c70d7e65dd7badbfd520c5be541111e1c