Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81c65be4560730b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 13:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 966abe9aa6b7b75f18232378d10e9c95 SHA-1: dfc0e87f7bb7d755f5f0f5f470508e7fd56ac5db SHA-256: d81c65be4560730b68bff405a79c2c6a38c7d7330831887fa7ab638ef80d6df6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=download+cryptotab+browser+pro+for+free+for+pc PDF link annotation
    • https://facades-et-traditions.com/actualites/file/giwojeju.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/63792039893.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210905140044.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/85914542587.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/xuwabagufibuwa.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/24c1bedcfbd99d306709e66cac04383a/93500664415.pdfIn PDF document text
    • http://contelex.it/userfiles/files/pobawanopiviwilinuzib.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/021058387569.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370014adccd---48173038491.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/67790158657.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/88775559728.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/budugotobuwerufobomigeb.pdfIn PDF document text
    • https://path.mn/userfiles/files/tuladunakeliji.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/milomadaripuwezowade.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/jafefikitozitelawagareze.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/makemuxaritotuguroxejik.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/wanor.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/mepawuzukijinerupakabo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613870d7a121a---jovumukonabesududuwela.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/16467978972.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/nawigukoxep.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3cc39a34655e5e3846b96de951b93cf6/tujisofaguvibisowotupujaz.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/xovinaxeforuxilofomakij.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/jekurabasadejomuv.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_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 18700 bytes
SHA-256: adf590b67e9bf024b09524f2e51f3f889ffe91a904663ffaa4c6135495bcb5f1
font_01_sfnt_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 10864 bytes
SHA-256: 7285dce7e5f3a68fc6f400372e9b499a0bc09614a15ecdca8227c6bc47b8059c
font_02_sfnt_off00012866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1