Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f46a2c6981e71c0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 12:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85566b0018b47f737f1f11cf54418323 SHA-1: a63137f317423bd10b24147e935d677254167a79 SHA-256: 1f46a2c6981e71c0e124712deb9f6f8da009061d022c407687fdced05dbad879
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://quangcaosms.org/media/ftp/file/xovijetadatoxabid.pdf In PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7557e52d03c97103b7a3b82d04b11464/95582807271.pdfIn PDF document text
    • http://air-ned.com/uploads/files/kojenep.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/35927179247.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/92307107606.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/mebezidiwijurinugeka.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/bizirofejevegukamum.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1aab52b10edd2b837e7b4db310a40831/49296705124.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/41360763539.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/ganizexudufurufewovexeg.pdfIn PDF document text
    • http://kmsenior.org/file/files/fidetope.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/6543988839.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/49867148396.pdfIn PDF document text
    • https://ienter.bg/files/nigisofuluragobare.pdfIn PDF document text
    • https://12shio4.com/contents/files/rajababe.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/99485105001.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3d4d2065---juzaxanosoxiduporanel.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/62790253193.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/punobomoxa.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/jusozejokagusuwonilazo.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/bularadoromijujenexigan.pdfIn PDF document text
    • http://sinostandards.net/upload/files/23946288271.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210901file///zareni.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/50233063646.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gapurunazusisakage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=descargar+shazam+gratis+para+androidPDF 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_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 18820 bytes
SHA-256: 6a72f72377d7ed3e8b87d8da250b468cfb81e24aa24c7750b623771711956b8a
font_01_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 10976 bytes
SHA-256: 709bcd8c86db100e9d754a9b2a8fdbfbd3156b276fa93630849a9a96e64ad700
font_02_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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