Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9d8dafba23e94a…

MALICIOUS

PDF

116.5 KB Created: 2021-09-01 02:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a5f7afd6de28060144e58deb067a2cc SHA-1: 1af6e947a5391dc6fa822e55f7ccca8145c4e9d3 SHA-256: da9d8dafba23e94ab2e6c670f3fff7a78a3b53e076a1c5371349913a6e7fd2aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, 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 via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

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://krisoc.ru/uplcv?utm_term=be+it+done+according+to+your+faith PDF link annotation
    • http://transportdiverse.com/uploads/files/34397611472.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/72818019962.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818bfd5f559---58568069004.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210704_DDC9AC6AE26BDA15.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/557780708610c1bd140f93.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/26192025353.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6aaa03770---90862962358.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/5430217309.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/sopejiwez.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fba024c75---pipazidonirirabel.pdfIn PDF document text
    • http://www.celso.org/download/30992522698.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a38563a4a---renezevitipuv.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/53ab8c7e799762dcdd275500ab47e98d/65604642622.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/196e7793d92c270043a0f3c45d36347a/69299685260.pdfIn PDF document text
    • http://etrustmi.com/ckfinder/userfiles/files/67980573986.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/bexal.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16070a17f0cb3b---38056005387.pdfIn PDF document text
    • https://signika.pl/Upload/file/76343935581.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/53473579016.pdfIn PDF document text
    • http://atiksigorta.com/files/78833763087.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/77281375615.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/gadefomasitusijula.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073b500e275e---33959353509.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202108311058141667.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/43318742325.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/80266658672.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/jibogerepasovewufuro.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_off000158df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DF 23272 bytes
SHA-256: 5bd762790bd27b6362f98de2de5ea782a892927167042ebecce78904d3cc6536
font_01_sfnt_off00019381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19381 10808 bytes
SHA-256: 338a63e79118744a394670e95bf4090b64654e49b9f632f95d8ff2d01363dfa1
font_02_sfnt_off0001ac39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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