Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6fdad776bc339d…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 11:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c6c94cda7fc8d6d758e22eddf2a768b SHA-1: 7f16079e86d37f2bee1ee0f7cc8b682445f86996 SHA-256: 9c6fdad776bc339dde646d09f75a9becc4a5447405adde1f59fd33add42bbc96
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to obscure malicious destinations. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a link farm and the ML detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/rv7d77koku239g01vjmkobk1k6/lexizosedav.pdf In PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/futitakalofifu.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/fazopun.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/wexefunipazidip.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/kezipipepozetadisumebipuk.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/bisoliv.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/valegoranifa.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/gewuga.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/jobijorotosovomibiwoteb.pdfIn PDF document text
    • http://highdesertrent.com/newsite//images/uploads/file/37104391469.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/sijogamesobiwimofibija.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/2326360119.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5e194d154ef965108035e18492b1b26/mitalopaxu.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/jujotuvanivozoxi.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/41869495522.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/7423025788.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/sabazudokudukedipolifiwo.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/55806387954.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202107241329593440.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/63119703154.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129359aed754---55328415853.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948779828a3---65218107392.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1c9a4d7ce---75848939835.pdfIn PDF document text
    • http://fedime.org/imagenes/24076885095.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c26cf54d71ec475b9f871a6d9a279924/vojizedefutexotefuxe.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc47493387---towilemobigikilegugize.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eab35737ea---mufofupavezenanariwekikag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=togaf+9.2+exam+dumps+pdfPDF 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_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 18784 bytes
SHA-256: 77a01c1d435ab140e23fd9710ab1a8ad8fcdb1aacce1a0e8ddb0212d942811aa
font_02_sfnt_off0001317b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317B 10920 bytes
SHA-256: dd521d2801040616911c39dbb23653d09ecf7c709999f9cbe361d597ad987310

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