Malicious PDF — malware analysis report

Static analysis result for SHA-256 7755844a93061c40…

MALICIOUS

PDF

87.5 KB Created: 2021-07-25 03:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd8206bd4cc8df32f5b4554814f0c543 SHA-1: 5a56765bd5c3dd8b7db5460d13f563b409100fd4 SHA-256: 7755844a93061c405f12a41074b30c3273a5b99c6041a6cd819d5db5a06a74c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS upload directories and disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, attempting to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8986b3c944---78721723818.pdf In PDF document text
    • https://bacninhonline.com/webroot/img/files/mujimigipokuzabaviwotupen.pdfIn PDF document text
    • http://abnicum.com/files/file/62742563744.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/kanozaxodizu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5b2c1d1f25d398752691d90e7a721a6a/33093897605.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/9bc13acf895a7994888beca9ffc83ea5/misitipeg.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/3528244525.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b075f3797---28429883285.pdfIn PDF document text
    • http://aps-mes.com/files/file/fefanelojowu.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/5874292297.pdfIn PDF document text
    • http://artside.org/data/temp/file/xodadawibozefobezilaz.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/931226280b4ea3830127b67510d4e1f9/batuberapipilejajonoro.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/sudupalaxepupuxum.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/beqr4qqbgpem6a47iaq3pfug86/4889186249.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c9e0ccaf5b69dc31d7fb949d48d89e26/83781102910.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0596fca433---13606491530.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/57889302316.pdfIn PDF document text
    • https://digireg.cz/upload/43249389277.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/46d07abb4d26a55d1c565a29e94996d3/xogujofagedakagote.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/xavafofasunorabi.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/37317760364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+matric+results+2019+via+smsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed6f099f26d---5940960793.pdfIn PDF document text
    • 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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 11172 bytes
SHA-256: 6172c81674fca00fbed959de6a90143b61c9811adcd7d51b8a4760a36542cb32
font_02_sfnt_off000121b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B4 17160 bytes
SHA-256: 19deeb64683c98875716c3ec09e5d535db2d030e80154d1b724020f3d19e68cd

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