Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aacca90b984a7f6…

MALICIOUS

PDF

77.8 KB Created: 2021-07-06 05:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: be3851d3ac1893892fc153dac2222542 SHA-1: d8d505ef906650c08886b100a0c50d0e0b121935 SHA-256: 8aacca90b984a7f64c5318aaf3ccbdb004300ed8addf4d37096e96374f044c9e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=gold+crown+volleyball PDF link annotation
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6779b28ba19cb0708db7b4fc9ee003d0/73316001768.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcbcf23fc6---76963314165.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/motigilisimo.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/49543142465.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621461758.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/53867441988.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/81278283978.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215241619395252.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210602155412.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e96c6744c---kafarepar.pdfIn PDF document text
    • https://advik.net/userfiles/file/vobutiv.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/f9565c581dc0fd083f40cbb5ee1a816a/23469137301.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/eh8rafrdqe3n2l7fel7off8nh5/16681598594.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a67f4f2c412---vupixonozaxununerebogop.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/up8rj6ujs6l3sj7m9kllp0lkh3/dewurapomojikaromo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821f69bcd1d---73890355607.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/zebudoxenawaniwizoxolotod.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/2982b89b22ad348a81f55827581473b4/jesowosu.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/9444121011.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6a3af1623---13146330030.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/57600234335.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b908924b9---wodinuviko.pdfIn PDF document text
    • https://blugarden.eu/file/noribotusizawewazewoset.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/leruxopiziwanedusabufilav.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_off0000caf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 10448 bytes
SHA-256: 7f70d20b905cb224e9481efab6f095daec59a2fc8e79b901ebe36613e24c8725
font_01_sfnt_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 17632 bytes
SHA-256: e2ead107dd75855a5d49c6f4e7f9927b7181730c294e891be39c5e92cae2bb18

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