Malicious PDF — malware analysis report

Static analysis result for SHA-256 479101ea3ab19f05…

MALICIOUS

PDF

195.4 KB Created: 2021-06-28 03:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8871126b7b0150c2dfecf742cb53efb0 SHA-1: cc2c9c5963566b63df137a43ce03025f518754f9 SHA-256: 479101ea3ab19f05511675c36d79e177c91e23a01a0b7042a3b7c1e7f82ed89e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URIs and the compromised CMS upload link heuristic indicate a likely phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 4

  • 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.
  • 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://chcial.ru/uplcv?utm_term=love+covers+a+multitude+of+sins+proverbs
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab03b6e62---27449008779.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/jezedoxurutevegavewoz.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/39e321e178180b3e1bfcbcf9a5dba7f2/64931102404.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160719fde21cda---55084960488.pdf
    • http://smclassof57.org/clients/34860/File/vigiwidobofi.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/71b8cee26dd20f1f331b73cfa72d68f3/ravuvoxupiza.pdf
    • http://msamerica.net/clients/873634/File/36962211421.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c946a4bb83---43724064883.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607249cf183b3---duzinoro.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16075a02e33230---71708928607.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90fe6f86b---95199493066.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8o94jf9r0npvd6iakr98hjoqc0/xidupojuzowide.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/xitobifinibozo.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qim9g8l6i71sl561s9qhn5dmle/subamuwuxemisade.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/03122b144f2f90e825936a2a931c60fb/66596150694.pdf
    • http://mppscstudy.com/admin/usercontent/file/lalikomesegaxuvawog.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0ce4ca964---newijubijixinazexovunubat.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/6caiu7hudc4vc14b08pvnldteh/83437408670.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d51def851c4d42fab07d92377bf07b77/60491416921.pdf
    • http://novussiteyonetimi.com/uploads/file/kejuxekitifepojisixugo.pdf
    • http://inarchengineering.it/userfiles/files/68385950206.pdf
    • http://gocep.org/data/userfiles/files/11569641084.pdf
    • http://giaoducvietnamtv.com/images/ckeditor/files/gatuperaberebibudebedubo.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/62a59ce0edb577bde41108eff8c196d5/jefavidepebiwojax.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c23a22d2e8---77829634049.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000268a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x268A7 16792 bytes
font_01_sfnt_off000280b9.bin
a5f4b2650382d09f233c14e23fa206a175ad2aeee1dcb7fba06b2863db375892
pdf-font-stream PDF embedded font (sfnt) at offset 0x280B9 29128 bytes
font_02_sfnt_off0002c41d.bin
2eafad099a69ee2d4a633708a146b9bc29d8291138d28b6741397055bcc7924b
pdf-font-stream PDF embedded font (sfnt) at offset 0x2C41D 19496 bytes
font_03_sfnt_off0002e58e.bin
03fb66047f23aba4c27102b0b7cdb7a4907c6d8121b816a814be71f6cba54193
pdf-font-stream PDF embedded font (sfnt) at offset 0x2E58E 11044 bytes