Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd056c1722b16812…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 14:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2674c1c730e12a66e198048e05cda044 SHA-1: 727a12c23d34ad0c008b27a6276434b67fdbb5de SHA-256: fd056c1722b16812d791a14ad5f12519a085a5342220e24fe52d86b32c0424c5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, functioning as a link farm. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=basic+immunology+abbas+pdf PDF link annotation
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/7263535869.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7a40c776810d0d4e314e629d620ad4a0/rivojizopotezepuxel.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/64922969638.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c545d4ac25eb31223944b5a236986515/filimijuwapoxaxukel.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210702161831_t328p2.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210725193556.pdfIn PDF document text
    • https://chp-travel.ir/data/file/62657962423.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021629714246267.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/97081285458.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/95180346965.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/36224582262.pdfIn PDF document text
    • https://rajaunited.com/contents//files/40763888844.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b9022630b72---82654163222.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/1e9d50efa64793d83c17ac0f20729399/92138983205.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/6db7e057728ff6896c3fb2f3a15994a6/44645656880.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347d2a02072---dokukeriwabefetev.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872b48bb8f5---rivipekigawufotemurug.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/kiximu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/rj30qmst59qfucmav7p7fd8lg6/vizofupozowudofuzuxemaz.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ac0e9ca22---wejoxuzojasekajixixuki.pdfIn PDF document text
    • https://kildevangen.dk/files/10241126813.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/79572582547.pdfIn PDF document text
    • 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_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 18004 bytes
SHA-256: 2d3b9049f2598f23a08b2b804d5d5f0a1733d4171c75ff58ed359417ca3ebe52
font_02_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 11040 bytes
SHA-256: dd2341c97ca423c9f56b8974709d6733529580d556052df7a9a6888e983d21d7

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