Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddca839464da8df5…

MALICIOUS

PDF

90.6 KB Created: 2021-07-02 09:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e5a736a5d1b607bc9a884296df4c563 SHA-1: 75e67f09618263caebde2a3e76aec6b18b4a9523 SHA-256: ddca839464da8df56f195343548ebf9ed83bcac0aa5d100847ed9c49b6afcd4a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links are characteristic of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908ee3b6215---84847913062.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33a2042d9---wepujovugerogosa.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/5160991890.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/t0dnugnp5856qg020kaptbbpkt/revisivefuvizofividus.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/sonimaxox.pdfIn PDF document text
    • https://xistenze.com/files/files/26325535395.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc33b4e251e---77285788241.pdfIn PDF document text
    • http://beiks.info/public/file/79073047301.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/66f3a26bd8e6572c2d6ac6a823f92eb5/sirekorosi.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160959d63d4a3c---59771101208.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7de70331---gumubas.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/vodojiwixagufoviniminawax.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/23231229792.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/42076290574.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/fepofigegomejebirudoxasun.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073db0f91a15---butuzimidekazifud.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9b1f07bf3---bodaxabawabu.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/29794947008.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a442fba9a1---gegipikukosi.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/semaveveruduvujujodidureg.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/2bhk2737gp8helmvqnld20ijig/72071536822.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/82b00e1de04d7dbfd9b265154894a0ca/40949639544.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/99346093568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=heroic+age+anime+reviewPDF 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_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 16980 bytes
SHA-256: b381d9867cb5d27f8178f1d7a3ee959c2cebcdd411bb1f4496c23dd1f8f7f9aa
font_01_sfnt_off00012c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 10404 bytes
SHA-256: 74d4b155dadd9267ce3db20f11d90466b02b4141b5a8c4e76a8b8ef5fb7bc1c2
font_02_sfnt_off00014397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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