Malicious PDF — malware analysis report

Static analysis result for SHA-256 10baaaa4a6cf3346…

MALICIOUS

PDF

76.4 KB Created: 2021-09-23 03:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b3272fa19222d625de2e9c1d13906ad SHA-1: 6e02f59fa916258b34adaa6798ca3b9aa781a2bc SHA-256: 10baaaa4a6cf334662bba324b1a16d316fe8994dbcbfa08174739c61b20d9414
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://highdesertrent.com/newsite/images/uploads/file/wodiparixaririnosom.pdf In PDF document text
    • http://muntepa.com/userfiles/files/makarogepe.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/98036593054.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/37933355081.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210911064406_gis23w.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210903060833138478.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/86265912043.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/39379297643.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/mujifowudikavuk.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/45234b14ad576bc66dbd8eb9fa52a07f/tilawijivoripe.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfa2b645c---pifuximet.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/70265222475.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/7146377473.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/59090037832.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/pejebam.pdfIn PDF document text
    • https://arerp.kr/data/file///24012050322.pdfIn PDF document text
    • http://kasargod.net/uploads/file/32172955867.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132646bbe45c---dadovuzewimorux.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/44545587286.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f8c110e08---59813441502.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/kamidaziwapemi.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210905001437.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/cr9vu8d6t3qgfp8a7fg90but37/zafaximimujelifinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=god+of+war+psp+iso+file+downloadPDF 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_off0000c733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC733 10516 bytes
SHA-256: 2ab7d32b10daaee05f702bf7ac4cddfd819bd8d9c93b6acb31fcf6d285276d74
font_01_sfnt_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 17208 bytes
SHA-256: 0f2bdcad7b711983f285673b86df3eabef02121d81ecce3d7237f40fa30072fd
font_02_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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