Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9708a6525acc683…

MALICIOUS

PDF

86.7 KB Created: 2021-07-08 23:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06bd468c03a0f6d06c9fbf9858612197 SHA-1: 3e20e1133bb154cc998d6ed84022de1cf1866f4e SHA-256: c9708a6525acc68344c52b56abfdfd0d0ec4cd2521a2de3bd039c85b49a134c3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators points towards an attack pattern focused on redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://coretry.ru/uplcv?utm_term=short+paragraph+about+yourself PDF link annotation
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8522d1bf9b---dojimogapapitodem.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/0694d7a41f0cef922a55ebad43ec362f/87277447732.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/nupupipaxobaj.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wobujim.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ece5caec---nutafope.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee2f88e2a0---43295124355.pdfIn PDF document text
    • https://tipresentoio.it/images/file/bakin.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/15064252078.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abd33d6e998---kupoxizijisefakotok.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a56bd935568---xoxelirujiviwelufetimos.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/77362836466.pdfIn PDF document text
    • https://windsbs.biz/files/file/pilanus.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/94810d319313a55d9e438f94c34dd731/vafakakitinamujubazog.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9503ba8911---47553532352.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b04a6d3d4---94600370418.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/0720963baf9803f838c2fd73d4c427f4/robivofewativaxepuje.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089158b167f0---kepoja.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/78204478351.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210704184344.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/vozoboxe.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/mapojorojufore.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086458846dd4---xolejalibopob.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/kidadodazomoged.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607565835fd03---44987620481.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/45899074686.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_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 10868 bytes
SHA-256: 2cf1b165d70f1c9c7eb421721bb4902daa9cb615f713f99d528742e75a69ffd9
font_01_sfnt_off0001083c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 17244 bytes
SHA-256: babc02ff56c78e31543573f8ec8a537b2a718fd77cf7b09e9f84888b82c15e1b
font_02_sfnt_off00013569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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