Malicious PDF — malware analysis report

Static analysis result for SHA-256 132ad3c5d839767a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 07:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a062b6121cfec400b212b0bd7f5a39e SHA-1: d097b660af2bc7fe98192cfc192973fdac3ef100 SHA-256: 132ad3c5d839767a581d0781d8938d30fe0c80bfa77bb9369195f01ec2e973e8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be to lure users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/mivisitemutejepedidajedav.pdf In PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/62653303295.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/93985082257.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a698264c6c4---87902280694.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e5eb97869d2f85d5802f1f73ede2f423/mibakovofupuxu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63b513ecd1---71596991926.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/14249126026.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/94810246984.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/sowaximumamodejilikudifi.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/91be3395ac0037adbef8dc5b871dbbaa/62052546136.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730b32decc1---welalud.pdfIn PDF document text
    • http://micruts.org/userfiles/file/judibemipevujumiravubela.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/88578353190.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4a4cb61124f94f32c98a02f14057a8bd/fotolewape.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/gedidazuzupetu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16128642e76320---jajudilamuj.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/72336678705.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/9935416882.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/32408657697.pdfIn PDF document text
    • https://la-klamm.org/Files/files/89581670278.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16076555661256---44749824145.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160800139217df---623745291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=postgraduate+haematology+pdf+free+downloadPDF 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_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 18016 bytes
SHA-256: 21b6b8934e34388644fcafdb5f2b626f4d2add955307abbce07cf46273f6a562
font_02_sfnt_off00012136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12136 11156 bytes
SHA-256: d7ac682a20479c40428ed9153d9f8d974cb9d3e27c803df52dd1768e7fba572e

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