Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda4e3691b43ee44…

MALICIOUS

PDF

84.7 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: 74e27e4e55f0c5e32e6760cee08c9a3b SHA-1: 5e4f72d27af6f1e1f5c7baf2b7ff265e4f36697d SHA-256: cda4e3691b43ee44504ec66aaadf38a160ad32157b78d79c6606cc5b4b94f6fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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
  • 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://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://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_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
font_02_sfnt_off00011ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB3 16480 bytes
SHA-256: b61accc1c61149868cd3d83c270f34389086798143772aad16664db73a441e0a

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