Malicious PDF — malware analysis report

Static analysis result for SHA-256 03af3539833dbdb5…

MALICIOUS

PDF

100.4 KB Created: 2021-07-06 20:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 138fca2b1f97be7cf64d82dc029a1922 SHA-1: a20bce5db4465683b7aa5594b0d2ccec5974a230 SHA-256: 03af3539833dbdb5d630456ac14cf01e63a541144fa5e025eb7b041c04ae240e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, disguised as a free practice test. This suggests a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate the redirection or download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://synerhu.ru/uplcv?utm_term=free+numerical+reasoning+practice+test+with+answers PDF link annotation
    • http://hakkabrothers.com/userfiles/file///pimubuxosejata.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wijivune.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/sexewijoguzurezir.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab9fbe989---luvitozikeroritut.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a837d8c7a3e---46797924481.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/wazujak.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a61515ae7---luganoxijafiluwukomojepap.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5108964c3d---97641603891.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/wopijikadupalejujifele.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16074022a616ca---87828119859.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/43156067011.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d429c687d---33117806233.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/23412584144.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/96646033099.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d07f304a0f---kidiperom.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/sotodoful.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/itlp5b36evovj1qr8tt372g92m/22407018.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d10250fcff---paxajusozupovisenadame.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ee4fc93cf---xojakukebufudarogil.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/4899307373.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a060af030b5---zobajujapikig.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/nakugebujumegugetenavakef.pdfIn PDF document text
    • http://gillyard-johnson-mahoney.com/clients/62114/File/14227562518.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/17761362632.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/fuzarasejerutulexurisoxi.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/24181868663.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607098a29bcf6---34367118519.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_off0001216b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001397d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397D 18572 bytes
SHA-256: fe761469665f6d850292b506b50c76a4ee0be7f04a74962ae71f89eef1b33819
font_02_sfnt_off00016a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A3B 10984 bytes
SHA-256: 40185cd47910ccac119f8b8fcd36b81c3b04a1420d50ab5d7c65a8a15e4506a9

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