Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bafcd9d688590b…

MALICIOUS

PDF

83.0 KB Created: 2021-08-18 16:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fec2386dce9a30668a6a9e4bbca75820 SHA-1: a8c7bdd8b46ac68cbaab1b09b61041505157106d SHA-256: a7bafcd9d688590b712017cadfb51d1e4582312606d1ebb8568a5be651b9f6fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link farming. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://krisoc.ru/uplcv?utm_term=how+to+set+up+a+walbro+carburetor PDF link annotation
    • http://booklandbooks.com/userfiles/file/8149147654.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/20652996810.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/83179629893.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/demalirepidid.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/timujebavakimuvowosopipik.pdfIn PDF document text
    • http://brukbet.com/user_images/file/ripafuzuzusaguz.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/76668298368.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1611588045b56e---2997036699.pdfIn PDF document text
    • http://builderall.info/userfiles/file/gosekosodejejopexomibone.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/20722506721.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/zifide.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/85200594550.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/m1ld8ifav2d09a3re355gktmql/maxenisarakisawedozetuted.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/muzatejekuvi.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/11745219254.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34b69f9e5---51112094989.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210704_82D68838B4E106CB.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dedbf044def---58902338977.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/48830728964.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/qbcq1bh1kkfef9jqtp1d8cuvt8/sonavetijujugadewonafofu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebfb532a6a---82851719948.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/falirumipugujavugifutemo.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079f08c77f5e---58059917999.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/19499583181.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e92a26707a---fuxokofamer.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_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 15980 bytes
SHA-256: fc1a7f2a4a90b85559259bdb7a75f2462e79381177f8ce8dc9513844aa44a36a
font_01_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 10488 bytes
SHA-256: 6c9152c032243b4f6f096f36d850c74689d74a05329a4c9bb61dc0c18ae60b32

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