Malicious PDF — malware analysis report

Static analysis result for SHA-256 198726a6a8a2ee55…

MALICIOUS

PDF

82.4 KB Created: 2021-07-14 09:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 3e797e603089ba3d424d8f6140302777 SHA-1: 7ba9a85c3ed5c48d865a3f30d2e42995cf8ec601 SHA-256: 198726a6a8a2ee558512f4a179f0e10324b677f02b42bdcb67c7c5a3918e3951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://synerhu.ru/uplcv?utm_term=paired+two+sample+t+test+formula PDF link annotation
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/7951345985.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/d095070d0d8d62509a90998a37e4d364/seguxol.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///18879298476.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/84486264256.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3bea48d3---18303070410.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/j4985bmndilpab21um3n3g140u/35466267693.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/46897323588.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/tigekenejukaninerevanag.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d218170b9b2---rovosabevekapufasezelo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b560ed4a5fc---bakajuni.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087affd8f76e---fekajakuxi.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/75005132427.pdfIn PDF document text
    • http://prota.ru/upload/files/17502223540.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e426d1f8f375761103f1c07c0d5fe48e/jesanulab.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/zixurefajoditebadove.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/rekulasiwufe.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a1e5c34f5---papikarusidaxojomavogike.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/92479987725.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/64276388907.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/n4o9v81b4l3rcba2u4jniko7s2/zupixorofojefixefu.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/45409471645.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/nolariseratefiki.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 16708 bytes
SHA-256: 2e3f3442195b9353dfd953aa0e39194c2765f3823126fd5c0bd2ddf2969b8fd7
font_01_sfnt_off00010bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 10740 bytes
SHA-256: aec13c9ac07a39db0779c016559fa3d0bc1c51a0bf69d9fd16d59a5658174199
font_02_sfnt_off00012498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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