Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d70218e9a19a6a8…

MALICIOUS

PDF

89.8 KB Created: 2021-09-18 10:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a82947b31c6cbfa3e6bc1cdb5114012f SHA-1: b462f1b2de84736da964852ee39a3fde18c6ef06 SHA-256: 9d70218e9a19a6a8d1866bb8ec8541274b3548a47203ec3d7940d5919ad69f53
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a link farm and a lure for 'fruity loops studio for android free' indicates a phishing or scam campaign. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=fruity+loops+studio+for+android+free PDF link annotation
    • https://khangle.vn/uploads/images/files/pabefozuvimiwevejakesi.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135810de1f4f---87809635751.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/kabubaxerixok.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/jiwipenarasebupitirule.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/palinotafosijefazuru.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/sinaxesizikegafol.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/84342471520.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/15919258995.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/rixirosuborezuguri.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/denazemizejule.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/20965068575.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136f687500e4---kelasimupazusu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae79572a6---sexujuzogogizasemubeluko.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/22128101887.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/pinesuv.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/18253158429.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/52263389590.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/povilaxufukudatelagipa.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/77290928323.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/videvigoteseritulumixa.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de76a6c35---58096033825.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/nejedifobidigaradoku.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/liwifiderenatu.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/58891319306.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 19172 bytes
SHA-256: 3eeeef6d5d137eba5e5a9bc5c606f60c3874ae3985d6b369663fe27341112bae
font_01_sfnt_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 17940 bytes
SHA-256: f0182e80f074cf85d55b7762955db9ceaddac29f1846af05d7c9a341d52f4689
font_02_sfnt_off000127f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 10680 bytes
SHA-256: 95114bd415ee96f19d9a7aa3f196894402c9a1f21c399eb8e0c6b6d8ea4e3a43
font_03_sfnt_off00014096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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