Malicious PDF — malware analysis report

Static analysis result for SHA-256 24600a1a7ddf5d1a…

MALICIOUS

PDF

89.1 KB Created: 2021-07-23 21:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bfccdb528642a9bc08e69d18412c3d80 SHA-1: 51892a26064c7d771338a5e76cc948ffcb0be2e7 SHA-256: 24600a1a7ddf5d1a032325d21fa992b2542e8a8adc75bd6ec8035cec7b926d43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites and other disposable hosting domains, suggesting it's designed to redirect users to malicious content. The presence of embedded JavaScript (T1059.007) and the nature of the links strongly suggest a phishing or malware delivery attempt, likely distributed via spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://suamayin.biz/userfiles/file/53887961268.pdf In PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73142d381e---vivusapitabudixakodok.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/fajewodevasetolaxovuxi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33ad5a7fd9---93986236024.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/80666588439.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4257a1dfb9---toturefenanenuje.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/43cd1dca46d74dbfb7b5ff539983eaba/juliruvinukanosuzajo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/003cf6539104ca4b45f41dd3345a099e/39189093008.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/sopuwagotamoxabuv.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf008306d1c---5832486882.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082106fb8508---91250376528.pdfIn PDF document text
    • http://rld-carbon.ru/file/16660630835.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab90db31c---95689756611.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/817035be8c700e7fc67e912ca94fa451/tinagopiguxaribujo.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021060216555423.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/60d747d8c3d6caa77c4f4ca928e65f36/37850228044.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/4763a11cd3ee37373cb09ee474199d83/nusivalotununitudaxop.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/60848985925.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a846bd81d16---83161014833.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/wufalivosibajugalex.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/46286732637.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/dagalinoluxabujet.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/72032604685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=5+positive+effects+of+volcanoes+and+volcanic+activitiesPDF 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_off0000fa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 16504 bytes
SHA-256: 03d97e304bfbd3c841e5d5c8cf8b8903b4a6a5c7727302466f7cf9e30c37226e
font_02_sfnt_off00013d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D40 10616 bytes
SHA-256: ed751a87f5e46119bffc68a61315f096c05bd748b139e628d3a9c7318e40161f

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