Malicious PDF — malware analysis report

Static analysis result for SHA-256 d482ab7df8412f9c…

MALICIOUS

PDF

77.1 KB Created: 2021-07-25 08:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 88bb172e54380625ac3f3647047fd3f7 SHA-1: 3dd1f9cf8773ac90b7f3b4f40dd14f6b1c0bf9b6 SHA-256: d482ab7df8412f9c42ed87cd910d06bd2708d380b9c9c13245e8f78ed6be7dec
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, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised or disposable domains. The presence of numerous PDF links and the use of compromised CMS upload storage suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://centronegozi.com/public/17471998968.pdf In PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a2493969d---54311518144.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf6e6bc0e9---zorikasinanokiwo.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160883c1b00cd6---12282421998.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/64620112191.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afee69a16e5---lizipogeteguxapizuruz.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/bf7a62969ab91d687488f0a18932619e/14488265466.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/nigewuvijenuladoxijumu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d91b2480697---subilitagitezojilutivuko.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///naverefakubenadolusix.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/55028131897.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/lezakumelupagezez.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/wenibaxomareresiru.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609cb9def1723---dejumir.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/29325229519.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/43871927496.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/35e137f45a29f039831f79999ee93015/wipuwaperixinerom.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3c53de19af2480e71e8d85ac27917b06/6687266088.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607df852993ba---79690102528.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/14jdn2tfg5mjhh8m6n22e0qr8e/63203133025.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/71024944522.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/pogolupiwa.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/13626070500.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/77311190028.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/26514813581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=adding+and+subtracting+fractions+with+unlike+denominators+worksheets+pdf+grade+4PDF 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_off0000c72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72C 15880 bytes
SHA-256: 75497a14197376385f31dafd5e6bbb3f1340a5a6ae35ad88180f3276081a3130
font_01_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 11544 bytes
SHA-256: 2300ecd41ac9928cfc4651638ab2e872ced86cc36c1bed0d0b4c7ce9a66e44f8
font_02_sfnt_off00010ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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