Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc806ee3ed53e02e…

MALICIOUS

PDF

93.3 KB Created: 2021-06-30 18:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cf8d8290a7e12c1b5137c432bf946fba SHA-1: 4c09ccc5534352b81d1bf96af927a05c4938a415 SHA-256: fc806ee3ed53e02e7a2ce049ee203511d573570c4bc7e664c3a53bdd13e6004f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://warsztatgdynia.pl/app/webroot/media/files/50242621107.pdf In PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a75bfac7fd---45131891080.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/18584948994.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/55926751610.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608464b321441---ziwavezadovaramofejivefol.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/roejrsgfhk0rq5ha3kpp7e32h9/tidagenezagazorefubolara.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/66a27a7e7232d966a5dc9347e97aaf92/nebejozaxuwibefixow.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/477878d1caf7573f546abf52bca085a6/89609433536.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/68125743558.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/49652633735.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00599636fe---31856424992.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/widunusiziw.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kasaga.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ee9c781a3305afa1adc024dc441748de/22868015832.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087487298a9b---bowuvowebogaw.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a7542735---63571493814.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/44814152019.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/8b596633d512f054c366e1413cff26a7/vorisanisudotexagiruludu.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/sukapinaroxizifexiwo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f1829549f57a0eb824e741bc53400242/94896296010.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1d1458a6---17362873411.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7c4d7c63b439ed81286e113fe257269a/xujabofifam.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609840c5183aa---85645969872.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/56086138831.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/03939f038fdd5bc31919f7853adeddc9/tomixotasagetesaj.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/71a0614cd71ff77505246b2d54999814/71087061276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=teaching+assistant+questions+and+answersPDF 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
font_00_sfnt_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 16416 bytes
SHA-256: a8d1e34bf444334761db8dd673e30599a677bf9ec537d4b136fd145dfe542046
font_01_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 10900 bytes
SHA-256: 4245612814a2bb22d41cf7c1d94aa8014b342f9c878c96138a1c42c51d5b1e24
font_03_sfnt_off00013825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13825 17348 bytes
SHA-256: db2ecc91b2ce6d641d0de0c42b272786c7586d401c9f63ef3a5dcae0e5e22978

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