Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c962002bd0ffe42…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 10:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0a4fae78fcae40ac823fb182f2a6897 SHA-1: 705bff9661428d5de66a5640ff09ba909bd3a62e SHA-256: 2c962002bd0ffe42099138ade11d7486ed5be71303c8d864d4a09b72be5d9013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm pointing to numerous potentially compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0sme81eri33kerq9hbfdbtlk02/sawipixovimomobo.pdf
    • http://erex.hu/upload/file/sibuzuduxexinudakixoz.pdf
    • http://jar-ted.pl/file/besivikiripu.pdf
    • http://yanartextil.com/firma/files/66150432225.pdf
    • http://schokobrunnen.com/idata/bubasejukuvotanazekotapi.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072b4535c373---16171867128.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160948d42a1115---pevunavuginavewegederojiz.pdf
    • https://i3mit.com/shopadmin/upload/files/20770428703.pdf
    • http://entryexpress.online/chapter_images/files/wedufowugomuwu.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/23e120b74e3f27c7e568f4e3c3ba39f8/nuvat.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0924193909---11044873981.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec650ea749---vatajemosuzarasexidoba.pdf
    • https://ferado.vn/userfiles/file/rugikukezozo.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609af4c677820---kejotabejis.pdf
    • http://dansensvenner.dk/imagesfile///39373587541.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bc0c04709---dosotukopejiwunalomi.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160847f1cc9d23---jasibujawivuvebubolumos.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/67a11b94999a4cba5e00d86d4288d547/gedufigowuwetov.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a86154ccda138b4cf8c53a736bda0be8/41302290662.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7ebb35335458e1c5a91ad787f28b3739/bifisuwoxidadefoketebo.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/xofufidore.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ab5d7471013b0cc5424c724c29c55580/7926037840.pdf
    • https://monyetmesum.com/contents//files/sanodedo.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607401c3b7fdb---mazavuwezuvofopivarorakob.pdf
    • http://jgbt.us/pds/userfiles/files/14251455197.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080aad8559cd---selazuliputekuwubupijajar.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ihsgod80fqmeflmmthkh1b9hq5/sinove.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=promise+smartstor+ns4600+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb76.bin
2a1db4b71dfda7416c11fe202842227da124ba73f7a0b94ce415520ce25ce19a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 17708 bytes
font_01_sfnt_off00011a3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3C 16792 bytes
font_02_sfnt_off00013253.bin
e31794c1cf9c02046eb361282d35b52170730e90a8a2ffa9617acb6e5d0c8259		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13253 10736 bytes

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