Malicious PDF — malware analysis report

Static analysis result for SHA-256 393faa1c19167d13…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 20:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a039f72f27218a962235f2f6d65645bf SHA-1: a22d4b96ec07a607d4d30ca7766fd2a353bf6920 SHA-256: 393faa1c19167d1379e5baf593de28f419ca4da72a5fd2478ffa227e3e83deae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the link farm behavior is evident.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ctnphrae.com/ckfinder/userfiles/files/tedugesogosazimugedaz.pdf In PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d5e740393b46adf246578685a17939ac/kobakizuxav.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/vf9lujg9mald4cvdfp5is5oagp/kovederokixosiwop.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/91819010515.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ec6a85510---ropenojoxezaripi.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/67240808508.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/8725943290.pdfIn PDF document text
    • http://tornado69.com/clients/40643/File/sokuwalatowizotesunas.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/u7oq1l946q5bl1id3ufoeamtnl/wetovoregite.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/94240128279.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/tajapepulivuxelixifa.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/80832298175.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/223c5925e90fc1127777b213bbd1bbc5/85638452509.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/53486222116.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/431663374.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/digudegizokukux.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f7d8bd721f434d1764d967e06ab49874/1802940532.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/dovukunojamu.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/kaduwef.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/zogusut.pdfIn PDF document text
    • http://charivne.info/images/file/mejoditi.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/9708900073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=long+distance+transport+during+lockdownPDF 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_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 17612 bytes
SHA-256: a9bd4b3eb87c227e3218a428a58c2453cf5f6e384e22c9010469922e2bffcea0
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 10924 bytes
SHA-256: ae6d5029cbd0a1989104252986a8bd1cbb1c23e2d03b944aef249342b9d0df72