Malicious PDF — malware analysis report

Static analysis result for SHA-256 17954f10b602db60…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 06:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a7a52ab649402bdfe96203e1627a101f SHA-1: 36cb90d5817afb3fd79cb163d93be8d7e22a1cc8 SHA-256: 17954f10b602db60e375bc50f53c7b5ed502e5dec342ab2f737c57a8cea10ad9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=optic+nerve+sheath+meningioma+pdf PDF link annotation
    • https://infotechloyalty.com/bot/ckfinder/uf/files/lefuzemojavejobigiziguxe.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66ec2e72da---pitep.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ddf190e19---239738955.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b930c5f51---42285634871.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/24080303485.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160998ba53b086---47125059126.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113cb33b96ba---zijevidusedari.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4c8f265b---viguroxig.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/rasabarogizuxib.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/91750596417.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a0c85a3bc---15392167432.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/75757490264.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/i4d0t90sjtc6lt6qdc4571jas6/xesinosilakorelilisaw.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/21804636837.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/tatufuzorevanasirokolorez.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/65868444951.pdfIn PDF document text
    • http://bluetact.com/ckfinder/userfiles/files/wewosat.pdfIn PDF document text
    • http://builderall.info/userfiles/file/gafer.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4cfe63a25---36402097700.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4c0374899---18845976617.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/20669207606.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/76645517818.pdfIn PDF document text
    • http://metzlerranch.com/userimages/69118811053.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/betapedoloxa.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_off0000bccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCC 15684 bytes
SHA-256: bc4f1e9133a1fc852e1d2e6ae9c0c4229d7294bcba3a6439cb3a75317c8a16ae
font_01_sfnt_off0000e533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 11112 bytes
SHA-256: 83eb4131d423e3b9863a27199e6ce6df0730a520e796fb9c825fb03360b7e44c

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