Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bdae814eece79e…

MALICIOUS

PDF

97.4 KB Created: 2021-08-06 07:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a9bf441ca2e34bcdb256678ea6088e66 SHA-1: f031f021315967b43b0151654e875d8a50cf753b SHA-256: b3bdae814eece79efe86a09b1ffcb5fcaa9e70a0541011dd70386ad225499f88
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 compromised websites or disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://xn--franzsischebulldoggen-lec.eu/userfiles/file/74353894763.pdf In PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/41793572805.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/napozet.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/70366715788.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/9051482106.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/muwipudifet.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa78d7da38---47942213315.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210608_197978919A4537C4.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246746a999---gupikapuremelezosazek.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/3nmvm8itv99fbvtuheg7urdevh/75606142691.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/68210844685.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/refazekodosogumet.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/2brp1n39id7i56sjl1v81t7cib/70612145542.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/kuzifofodogufukaduvodana.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90881f61c---befarupikuneguwomipadani.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/96480486385.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/52991600744.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aab39da5b61---15870547295.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfff695da2---nufavafumin.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/4422696559.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/12549427913.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/22401594004.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/37058352392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=2008+polaris+ranger+500+service+manual+pdfPDF 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_off000115e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E1 17828 bytes
SHA-256: 5b1546bba072a4c0ebfe619a5a0f2606e2badcb13f023e80ba9cbcd84d254c40
font_01_sfnt_off0001445c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445C 11520 bytes
SHA-256: 3125528139951badef8fcf044993187742c624b0152f5d06dcf887ba3f9c8b65
font_02_sfnt_off00015f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1