Malicious PDF — malware analysis report

Static analysis result for SHA-256 0007636202547b64…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 05:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c6c52e91c0949fc54f8f65ad8ea6214 SHA-1: 30e56c216f2ba87732fa5686e2e1d06f5c00123c SHA-256: 0007636202547b643fe5a58024cdc2026c9224a0cd1818209d8b32987123286d
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=lulubox+app+download+apk PDF link annotation
    • https://panificioilcavaliere.it/userfiles/files/navazusapodifeperuzibit.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faf9fa2783---64072188134.pdfIn PDF document text
    • http://marketingnews.fr/images/file/mofovaligufiberibu.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c9a4396904ed1a4b4d3c16a52c0abfae/91724909370.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8199476f1---68921617009.pdfIn PDF document text
    • http://midospa.com/upload/files/20383800016.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/jozadudoxirusebopuzafipon.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/29827461522.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/78146521959.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/50246788822.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/repopefonololojevarexe.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/49967629418.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146a545b5921---jixixiwuselowuzutakevox.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/64033052470.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba62cbe2e---favox.pdfIn PDF document text
    • https://ms02bet.com/contents/files/70198760394.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/welazupe.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/53642386807.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/nafowonujefujoteda.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/43618720627.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/boxojopojeg.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/70022882573.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/pubejevegefiva.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/jonabeleruk.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_off0000d32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32C 17084 bytes
SHA-256: c651b3225da41be11919481e465f27eb391de4069c1d990426cd7f61bd6480ea
font_01_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 10272 bytes
SHA-256: 4628b1fc4811b5d95a8a9f7b3faf8b144b0f6100cac9bf92499824c2aa2e69ab

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