Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac85282d0ec6a97…

MALICIOUS

PDF

86.5 KB Created: 2021-08-13 11:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 37a5f326a3960c2e003800b428fc450f SHA-1: 23a72772e739a349186de44bdb5a97635add4c06 SHA-256: bac85282d0ec6a9786b6c99afade2523b963d88712bdb34856138ac54b22ace9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets are indicative of a malicious link distribution scheme.

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.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5844b4cbbf---vonutuvolametezawusifogo.pdf In PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/31174984581.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/e3265954ac58622b53b44e99081ca796/zorosorovov.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161047a0216c7d---mozirirujototimadedujubon.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c6d6f91a6c98d0362b269452a1816816/farenibofuv.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210620_29be2.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77040d7843---87149245105.pdfIn PDF document text
    • http://fxmeat.com/upload/file/f1cd34c735b38d932eed397561d5c9f3.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5iskb6cqjh88glbuvo9d2gk56f/55798637162.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/sopanibewakilewopoj.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/nalilefeloxibasasetu.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/bilevukebarutu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ouf6bkibnqrtfgb56p669bdtbq/filogi.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/fepesarepuru.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/73219629212.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/fozedarikigeluwid.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608745c957180---74211277065.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee3e80adc0---xudikotebamunabin.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/tanawilosupigoget.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/38684df4038726e26664a03961806f56/jokoduk.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/36440445224.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160811e83dc528---75551453767.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0cad81f3be9ceca6d995681dd89f7a3b/46515100054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=que+es+una+mezcla+heterog%C3%A9nea+y+un+ejemploPDF 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_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 11344 bytes
SHA-256: b9aef034d05beee9363881d53e22751f6337cbc58357af8297ba5bf37367ef39
font_02_sfnt_off00011f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F32 17100 bytes
SHA-256: 29c10cd718f674c7e69a79c07a57c03cc5cb8be7c8cd96371f73095990cb7295

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