Malicious PDF — malware analysis report

Static analysis result for SHA-256 507274099966a148…

MALICIOUS

PDF

89.9 KB Created: 2021-08-30 13:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd1e95a02b7e4d4e2b494842622746f5 SHA-1: d90e77349deed5be217a51d3609261639323dda8 SHA-256: 507274099966a1486c7662462612f47a02d9f326ef1262e82d8f2050983478ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://irlanc.ru/uplcv?utm_term=sanju+full+movie+watch+online+for+free PDF link annotation
    • http://daphongthuyhueminh.com/uploads/image/files/49824038446.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/96482598236.pdfIn PDF document text
    • http://aa-nusd.jp/92745629696.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/666b8a9e78d9ce3c180e6059ee2550e8/kebet.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/65655928284.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/bumiram.pdfIn PDF document text
    • https://mauspro.net/upload/files/54908629396.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/1266922436.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/64720279990.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/66764042459.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/vakebunipanifuza.pdfIn PDF document text
    • http://lamdecal.com/Images_upload/files/xasomimajipa.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/nhefcvglb1453p8dm0lp1279f8/ginifaluronelikuzogu.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/35474422518.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/37825462411.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6d100bfa---lilisamuk.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9hct705lo3cqlm6u9rumbcqeul/varumeriwunobuzalotari.pdfIn PDF document text
    • http://fitviewer.de/files/file/bowasifimevasuxum.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/98195236928.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/44759224666.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/26759980716.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3b084b848---57333990451.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/lokorunilibugu.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/riguvakuxamejuleba.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/016e9c2e0a3a65770b401acbe0a19bd2/bulamedolisetasosegupu.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/pepugesexelaravapanuvi.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_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 17520 bytes
SHA-256: 156aa93b0605c48348bb2d3ed166e871f5355a94b0da9adaaf3f22a25da658d8
font_01_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DF 10888 bytes
SHA-256: 0f74491f181c5e1d73159e6d2047e2e8c8678f9093b8f21c951647cdaa82b899