Malicious PDF — malware analysis report

Static analysis result for SHA-256 c392bc4a980cae7f…

MALICIOUS

PDF

193.6 KB Created: 2021-07-24 10:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19affeb542fa6c7baaa6370894191ca3 SHA-1: d05a90b168bd9b63b7e2e95cf97ea640ce919c44 SHA-256: c392bc4a980cae7fd3b94a6056a13c8901ca08c96c82fe43c43688db7dcd5bfe
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The document body is unreadable, but the heuristics and URLs strongly suggest an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9587

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://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc636d4950---83972783228.pdf In PDF document text
    • https://radiosmile.hu/upload/file/fomofoperisab.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b73207850ac---gejozenefotuboduf.pdfIn PDF document text
    • https://palet-school.com/files/files/50899681396.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81b0967e5c---95214430294.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c788c196b3---pigojonabezupero.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/30309171856.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609925cd54d7d---97241209848.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/25865973597.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/47c0520668fc9da33626de7e08e53910/bavufopisutubulare.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/14876008259.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/8a019776f2fd01d021368f17cb065e0a/8545887640.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/jixexatifefirevo.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/52480284363.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/97690907829.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5248317f2---sitedikaran.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/6a10a382c715dd95740345b16355b18e/13614211408.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086248e8cfa8---furaxasavonuwobexamelin.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/xotidukifimudedu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d591277cc913ae7d78506ea871bc9c1d/mizutimuf.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/jabivorovufegi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607045dd2a615---zoditewilimik.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/rukavab.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/1031959451.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609472961b173---metudutimekivi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b56ff2875500cdf9df63702b65e54707/puxeva.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/625afa55abcc8b9167d3da7d17410d7f/33891093537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+religion+reads+the+quranPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00028e40.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x28E40 26012 bytes
SHA-256: c180b1520dc81b6a94c69c76987069a41ec945b637aac0ef1f44f4d238a914b2
font_00_sfnt_off00025df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25DF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002760d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2760D 10764 bytes
SHA-256: 5475be0c15f6487167362b96419ba62e27ed90fad43bfefd54b85fc062ab802a
font_03_sfnt_off0002be5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BE5A 22884 bytes
SHA-256: ab6ae295bb6ae6774517598852546b54794af167e199af6730b6622a3884cf02

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