Malicious PDF — malware analysis report

Static analysis result for SHA-256 852b90b5a45ab60a…

MALICIOUS

PDF

73.3 KB Created: 2021-06-29 01:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3ee7283728c07639dcc7169a7c031569 SHA-1: 8a823e103625588f487c40acb0c3c54030d21504 SHA-256: 852b90b5a45ab60a1a37e3365ac7d271b45506e778e1b85ef7629730097bf7f1
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI links and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://stacjaregeneracja.pl/userfiles/file/16967722708.pdf In PDF document text
    • https://stvorki.ru/files/file/zimowa.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/pozidife.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e91a7db362d8d38a994709c08e2cf834/22894330090.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f2d5fe08---80537423253.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071db5a1f2b6---xepewinesiwof.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021061421284870554.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/bujokevazukasamo.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/vufenofefegelabofit.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d39b5bea37---pudetinogilus.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fg50t1klfmm8bu2flpjdpfp180/66065371544.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/56deb4160611df09f098043fa322c900/vilasixa.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/weneni.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210618115909372.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5adb9113b---bejowakupojunajubos.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/xekofazerim.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/zelivowozevarugimejoxiz.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/sariruxibesureronekivav.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/3213299495.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/e6f5c7adc5cb9f10ce8957282dae0da5/63424111766.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/menerijemuvatutuf.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/68442223929.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/92624357759.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/17407670333.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/59768368593.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdb1a49cc9---18758260846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=3rd+grade+review+packetPDF 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_off0000c054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 15376 bytes
SHA-256: 550313c4c72ef2f8ec8dfca63a5cc08c5e9c84649e78134bcc2dbf9e740c1e3b
font_02_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 10568 bytes
SHA-256: b8605418d5550457c40be42697d5eb56bc4a3687d6bc594608cbd6573662a9c7

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