Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d44593ed081a67…

MALICIOUS

PDF

76.9 KB Created: 2021-08-04 06:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad2c54b145a9d2ff5d08f3573b7e7be8 SHA-1: 0b827ff739b21d757504674f5a805d22660ff5fb SHA-256: 05d44593ed081a6780d8760539eb83f205ca36f6350ce2689a8c18b52de938a3
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. These links likely serve as a distribution mechanism for further malicious payloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://stlukesfp.org/ckfinder/userfiles/files/17870881218.pdf In PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/thbttpe9ui2ijqffc5ggothj36/zomibox.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c3a32814820e3d7c56b7083202c6d975/69468590962.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/busima.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/zubilolujilum.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f76c198f7---fuguworufepobexiwerilika.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ujpeqk55p6st1slnej8m8db08k/sabugimivizovumibuzo.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63a82c9ce5---guliwoladi.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/26920444829.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/1p2ttu6ufp0vgbonud4e7gdvk6/6445002803.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9300acf14---zolid.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64e35e4b71---xokomafusubufiz.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/cd4ebc591b2b58cc9a2ac9e98dbb519e/4941857964.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f2e554be2705b17fd8d75912e4685e96/70365349589.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/guvukinosuxivedekanib.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/14317641677.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/4riico2kc2dbe60o8mevfq31g1/tusigudezalaxasota.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/fijeguvivogafoparevajuk.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/dedova.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/18849246449.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7750cc142bcd396bfe19effd423cded8/xasuwap.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db315aa17f3---nerofijijudog.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/wakoga.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/64973a5db6c2a09369fdc03075204e95/20492367104.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/kalokezuxapusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=receta+facil+para+preparar+pierna+de+cerdo+al+hornoPDF 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_off0000c80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80E 10596 bytes
SHA-256: 396f881cd7b76afc0112ea5ace93ab340e117c4c079af6ee8b30f5c9a5e52fcb
font_01_sfnt_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 16736 bytes
SHA-256: 7c32dc99759928c6c300af77bc6021dab78ca96278e6ad34537cd4cc011ae939

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