Malicious PDF — malware analysis report

Static analysis result for SHA-256 785b749013258396…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 22:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49c2d2659bdb6024d9f92dd012c6e99d SHA-1: af7d8d48393630ac786fed96348acc214489f120 SHA-256: 785b749013258396312b586c98846a859274f9c45bf9a079d78f2af1b2ddaef1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/uplcv?utm_term=como+bloquear+mi+celular+android+robado PDF link annotation
    • http://madinagirls.com/easydo%20v2.00/files/uploads/rewolugonuk.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/89912465260.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/suxerikosesipipixogilane.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161358c50edaa5---50319211450.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/72363402474.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/30170167711.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d57819d9b8---37432871713.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/71449624105.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/5767748425.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/25746697283.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/58612473323.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/q1mpncgca5idalvsbbomk9mr02/gatefovutid.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/46475227268.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/xagoxulixol.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/87732705146.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/15984256774.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/zapalafuritadedo.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/jozafigorosin.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383d233ff6f---gekimipu.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///48833534196.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/69980666305.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/80482160873.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/45908569162.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/51373516782.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/67707789922.pdfIn PDF document text
    • http://dongphat.net/upload/files/fotadoz.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_off0000d2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 18948 bytes
SHA-256: 131f6d728a488f14e2daf2ab047e3924325d1c271283700a9fa6efe0ea8fc54c
font_01_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 10684 bytes
SHA-256: de2c10ebdff862ef61b8d3036eaa18a4af76ec9511573bbb16d975a4f7571254

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