Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ce2bef502ff661…

MALICIOUS

PDF

88.7 KB Created: 2021-09-16 23:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89cfe3da470902fb1d0637ed82dc04a0 SHA-1: 4efec67f19e25f65a8a417d594d0c656a47d7fe9 SHA-256: 76ce2bef502ff661635c69a6185b4d2c0b662f89422b9d4199e45eff4dc2aa93
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier strongly indicated maliciousness, and the presence of a link farm on potentially compromised infrastructure suggests an attempt to redirect users to malicious content or downloads. The embedded JavaScript likely facilitates the redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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://www.prshots.com/ckfinder/userfiles/files/76832190388.pdf In PDF document text
    • https://llibreriaha.com/img/events/file/13576827475.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312af253825---vadovanaratekime.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d113450611---kefutixafedojotetobujoso.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613034a40a7b1---gasuriwiwaridibovoz.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/2334974326.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/xajixavobineterigude.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/1708159299.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132fabe270ad---94863230867.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ced18c032---91966558161.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7c4abfd5---mavijexuzufilur.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/fikebixuvax.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/57790829255.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/dijewajibab.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba5de4481---vonoxivilexepugusisomawo.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/voregadaturejuwubiduba.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/gonojiteluxino.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161423f8e588fc---dagiwelugofob.pdfIn PDF document text
    • http://keramann.ru/uploads/files/70894686764.pdfIn PDF document text
    • http://mylodge-naoshima.com/xafuza.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c5e5854d32970e0b183092aca4a1b21a/27408686575.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/karatusotudetu.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/wuzosanawigowu.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/46013100508.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/tazorevedonenatoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=instagram+mod+apk+unlimited+likes+and+followers+android+1PDF 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_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 18544 bytes
SHA-256: 0cfbdce31309ac7d7fa8f4ebd394e11a7ee6eb5834bcd50a748f78dcb0520613
font_01_sfnt_off0001227e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 11120 bytes
SHA-256: 7d8169e2ff3ce10fecac40594ae014b91a9e0346f468d497ebd4d4ba11b2fa30
font_02_sfnt_off00013c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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