Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85ba8331c883b73…

MALICIOUS

PDF

86.8 KB Created: 2021-08-27 22:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7f1c602d04584f07f8733de1d1234575 SHA-1: 317fe0e0b4170fc203cb3547f576928d506378bd SHA-256: c85ba8331c883b739b9bff5f2d1770a9eaec9a226cec5c29145c367fa6502ca2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains. This structure is indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://jszl-rolls.com/filespath/files/20210819031231.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2aaf2ba4---68659793949.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/va4279ra9depa5neiokv1nieg3/rukuligonamomekikobuxular.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/lawasopoturomeb.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/sanediriga.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/rusubepapegoter.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/banibedefegerigafesirizob.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/roterumibekusuzupevaf.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/2150e609ce6c4a3860bd0abeac6b7449/19138782905.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fee6b5400bc---wutifupobubikoratotegefow.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bfed3e92d---fetidufinudajifirutemanu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5c7e2079da7272d00b3d08f3731d9dc2/7756497989.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/77293757192.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/90116058927.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2056144f1c9d0e999c1b14a4a90529f6/34783514790.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/linutigazag.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/jaberebilajomivi.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/70495684489.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/wezokazebo.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/72677053136.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/polekebilosawetuzewav.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9fb8fe84d7b732c8a4fc1131c7e91ecd/68228968641.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c2ec17e8---71707309910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=supercharger+and+turbo+togetherPDF 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_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 18828 bytes
SHA-256: 75ab7e1e2caf7a6dff9683a17cc3d6beac5f6008da97985ca62f1f61d4dccb2e
font_02_sfnt_off000134c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C3 10804 bytes
SHA-256: 53dc472bb07111c4f3a5be93529a6bcf7785b58e7bc6ca36235687bae698e491

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