Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79e1a9cb56f90bd…

MALICIOUS

PDF

77.2 KB Created: 2021-09-13 18:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67b546b2a43fa30f6f709277adbb3116 SHA-1: c5a86b401a5a314926444795ccff5529048159f4 SHA-256: d79e1a9cb56f90bd2d2f8e791bb64413fd7b2cefc9309e596b95d79d3fa46781
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, including those using CMS upload storage. The primary purpose appears to be directing users to external resources, which could lead to phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://longvu.vn/Images_upload/files/xodaboposotimafanokukop.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134c7e7c19e5---kugatafiporawezejibejogal.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/peganuriwosawibeleg.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/futotimelarog.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/sazadepapefivetiruf.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f7606c6e---92244054050.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/33969085849.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a5846cee---66624018218.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/61690544467.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021991735587620.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/29084855950.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/18933548200.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/detisaxijebires.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130aab8360b3---kazasepewujeresipenepedog.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/6684126766.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/kutesavibeboborafubowomoj.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/kewejonadekopagutanemov.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/furir.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/56868577087.pdfIn PDF document text
    • https://penzion-palice.cz/content/77995621428.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/32151588569.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/fufuxenubawivoxivetavilu.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/pokokelivigose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=maze+runner+scorch+trials+123moviesPDF 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_off0000c901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 11056 bytes
SHA-256: 17556b631d954fb13eae342395b7a45aed1feba71664628babeed7c553202b0c
font_01_sfnt_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 17204 bytes
SHA-256: f889077e34f2b68cdc2108101908b9fcacbabba33e59e17f47252707f48e13dc
font_02_sfnt_off00010f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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