Malicious PDF — malware analysis report

Static analysis result for SHA-256 b997e42916680ab3…

MALICIOUS

PDF

75.4 KB Created: 2021-08-15 21:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3a89af703a8950d0711e8054ee41183 SHA-1: 1bb3c3225d43b61193776f0e9ed0d826f10531b6 SHA-256: b997e42916680ab3a55d4ed822473497e6a2587a74235fd10e42f7198be18dc6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate high maliciousness. It contains numerous links, forming a link farm that points to potentially compromised WordPress upload directories and other disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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=baby%27s+day+out+hindi+download PDF link annotation
    • http://marketherballize.com/ckfinder/userfiles/files/dirid.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57d8621e8---tunovukuxesotuvol.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd024cb444---46507374353.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/jimadomugebuxuwop.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/16088922587.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/uburqnhevv7qkev2b18iufa1pt/karuralefikogurodexedud.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c552fc24f6e890d24c404ad6697b6957/kefusujolawogonel.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/87042395058.pdfIn PDF document text
    • http://coebmsf.com/userfiles/file/wozisajog.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/uu7c95hsn0dian33hvcrdcj3lp/69559672343.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e339205f6c---28860512690.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/55075857610.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7c4049b64---lenazimirizobagekowo.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/88798866039.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d00d6c6d1f45600daece11a4de7b475b/demuwakolonun.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/roporovamuviturabexo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df9a1690bd3---69051511032.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d0e6ca3444b35a2844d30027df133a38/jogij.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/kibevupixazugutetibune.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/74363969750.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c4951533503---gelerorizabovuwawudiruv.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160beeb53c697a---70085525797.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/14797847836.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160878656dbc72---29529789100.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/249b3100cc8e2b694eccc3adb4393c40/lalosokilalofobira.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_off0000c408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC408 16540 bytes
SHA-256: be026e544cc83447fbdb25ad6367de1dc14909d05f32b00ec068ff71ac2f7e72
font_01_sfnt_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 10640 bytes
SHA-256: c5c6f3f827edb592e1d9814cf3bec5ec9e47c8cd2aad87f0de63112922c4fb99

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