Malicious PDF — malware analysis report

Static analysis result for SHA-256 98de43176b3caee2…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 12:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 14482c5e44e4b49b375e6c2a6a87a694 SHA-1: 2e516f3a0b97a2e10a4b7d787bcbaa69c32df0d5 SHA-256: 98de43176b3caee2c019fd80423d9617d388c9e6119a616ded398da823dd3882
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many of which are flagged as being hosted on compromised CMS uploads or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://badoza.net/userfiles/file/92099195995.pdf In PDF document text
    • http://eptesteplelek.com/uploads/file/30313288453.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/sapebuzuxi.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/pibavir.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/wizovevapogadopi.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/golukulavi.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/pafafowetoz.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/62694734257.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/43352620499.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/96178826734.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614314b795cfd---sumobimadofisixozuveduf.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/02541ef094cdcde52128e921e9f0fb1e/sedivelifimi.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/17331227981.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/misur.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/saboroxawuniwaxab.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/remexetinatobo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144749ce5cd7---27787501796.pdfIn PDF document text
    • http://innotack.com/userfiles/file/21806206979.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/bovibaposigujepalugikumuf.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/rimoguzud.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/58265942253.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1614480f0c74df---95948930919.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/jalovebajulalupoweposezi.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/84395271649.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/40288761992.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/66340412908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+check+data+usage+per+app+androidPDF 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_off0000b5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEB 16756 bytes
SHA-256: b485858f5fef4e06c13a644873d254c58a42a3201591d5c12732ef048cd7efc2
font_02_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 11016 bytes
SHA-256: a2ddc39ac0cac4dcb0d5c22095755c08dd85f3b2d6e591c15180e5b721b071f9

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