Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b06967a8616a192…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 15:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fdbb892312454f1b95c279f725e86bd6 SHA-1: d6346d24691578523dbff9e47a9de5dd5948be8d SHA-256: 3b06967a8616a192d7e05769559c27335ca5d7324dc59d15c71cd487b1a4d11d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and its nature as a lure suggest potential for embedded JavaScript to facilitate redirection or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ecovn.vn/uploads/news_file/99666066975.pdf In PDF document text
    • http://vertracapital.com/uploads/files/jusukujegepowozoleg.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131639f4b17e---77216653990.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/tiwenojodowevonosamiw.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/velarigopabojek.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/42047679060.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/27331259695.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/pumidetijipimesazerudijip.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/69954082238.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/75676649333.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/86252411616.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/gukujavemabipazu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16139182bd04ef---21184065546.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/60088234095.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/l417blnnnlckt7b7vbgbi6etke/potavat.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613774f728eb9---63898113378.pdfIn PDF document text
    • https://vzglavniki.net/data/file/gilolitanasewuro.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/sawigojinisarowajepen.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/75630650381.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/12618707962.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3abef6c8---18806508298.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/zonopewarugepisek.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161302f781806d---27061131615.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/tuxopejide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+save+phone+number+in+sim+cardPDF 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_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 11116 bytes
SHA-256: a03910250687af6d67df5870c1db2cf4bf1c122fa0f22cb7ad330e19fd200722
font_02_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 19168 bytes
SHA-256: 0a26d022b348ca23d53de5a4f17581a1715326980ef3abbffac42174d3b56514