Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4da77c57f958418…

MALICIOUS

PDF

72.1 KB Created: 2021-07-15 21:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd463bef083ffc2621e5a6eef2615a89 SHA-1: 10926567ab61cecc8986d0b59ca9edc6f7d8910d SHA-256: d4da77c57f9584189f77e919c3cdd37d1dd6364fab1a190d6ebb9687df1f0c2a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or phish users. The presence of JavaScript indicates potential for executing malicious code, likely to download further payloads or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7043

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/10f28c33a170d04dae6e99800c98dac2/52341612080.pdf In PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/40c6b47a32e2bf8e66141cb12481197c/26273863627.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/sajisolivuf.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/47660104873.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/u5gd7kkgjepfjlbckit1nepkbi/wovolererimurukonuwajole.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/kowafilajawuloze.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/4bb6341aad7f3ce61ed967c744e36e8e/23915072543.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/4975678624.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779b770d8c5---52260807894.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/7e685318osmm670qamvh1jnau0/72867306066.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/datixoxexanonaxuvipetazad.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098feb3ae9a4---puwufipodo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6c59249906eedb4c1d1443a1e8ebb9e5/lefiferekojepikugeju.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0e00ca4a04dcd87ba514818a77685abf/67265021254.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/muguxilivodipuvexuzabota.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a799dbd5ced---69544827895.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609215d78b3e8---2181177743.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/wapak.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/falizote.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b90010a6a36a2c15be74a9dc08b8dcaf/74046177068.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/13878787749.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ae2cc45298db33e0181f8965515b7433/buxadijumerifoxisij.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/gfq65v7tsptcq73s9h2tljiea4/girazivi.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a45a9ca26b32716a98e24af0b738195e/tazibadedunovebemaloraju.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/74280323764.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/0db44d31684996db892c8a886c6d78da/95940410407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=two+categories+of+printerPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 10660 bytes
SHA-256: 8b1d8ddb5e02451c44f84dc4be9ea1365c93778d9e4b378a855b83f7209aadd7

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