Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd860b3b16966ffa…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 08:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73049815844d1c272144c33c5f4fc550 SHA-1: a9923ef075e7b49c6a05f5e7f7e712612d1586be SHA-256: bd860b3b16966ffadadc81f0b7751b6921c397ee0b3e5ebb5d8f5782879e5f40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous links pointing to potentially compromised websites or disposable hosting, likely for SEO manipulation or to host phishing content. The embedded URLs suggest an attempt to direct users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cupta.org/userfiles/files/20210531134614.pdf In PDF document text
    • https://aspirans.com/files/file/63828700498.pdfIn PDF document text
    • http://amdind.com/userfiles/file/wopijuwobanu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16104a1eb179bf---21898894222.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f275a93f52e---28839844611.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/gosidexawajufusovu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136afec56766---jivojalikor.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/1ifoarol1piq6479713rav3dj6/zidase.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/34611036523.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607827e9bcab3---35747940123.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/tisedigasaxikibululut.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/19717072571.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/43057748704.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/80899478189.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/55430881908.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609693824193c---jojageduvexudur.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcda927c842---24184534520.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/383075baa53175bcf06db18535356b5c/xosatimekopamugafokugi.pdfIn PDF document text
    • https://migger.dk/userimages/file/22665691752.pdfIn PDF document text
    • https://x-software.cz/data/file/66078821374.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/21511741183.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062409532312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pengertian+kekurangan+vitamin+a+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

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_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 17688 bytes
SHA-256: 88e241bcbb9810d0d6ee9534a9ba4694a23b0a304ac32190b346d37702034c9a
font_02_sfnt_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 10764 bytes
SHA-256: fa3439c6207938452e5cb9db461ba4c06addcd3a188fcd1864505fcd29c975a2

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