Malicious PDF — malware analysis report

Static analysis result for SHA-256 76da5859cf60e62c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 09:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7127d7c9608865a0ec20bdda4412a6fe SHA-1: 0817754b5f6b7bdcee0bf5e0e451703e8f839940 SHA-256: 76da5859cf60e62cec7b26d1b870367651061324a370924387cae1f3f91807d3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a link farm, with multiple heuristics indicating it points to potentially compromised or disposable hosting. The embedded JavaScript stream, though not fully analyzed, suggests an attempt to execute malicious code. The presence of numerous URLs, many pointing to PDF files on various domains, reinforces the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://diennuocdanang.com/uploads/image/files/88768870229.pdf In PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/pomapimunubitoni.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/farotobupusopegej.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/turiboni.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/57890227654.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/vosaxagisobaruvanagubine.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/76320c7ab5e26de8374d9db48c316695/jiwaludavizimedumeziva.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/49662450128.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/gefepimep.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/dedareluvafuwomobe.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d3ec8d76---rijoluxoligakuko.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/nuxorawuveputuwom.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161381c0c848ab---93781566313.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/61271891915.pdfIn PDF document text
    • http://annabarons.com/files/files/97261826955.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/1943428258.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210909040330.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/xusoxopukik.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/luxosonemi.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/zapitakavoderukafigumus.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/97498949362.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/gigarubomaravaguj.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/48402318271.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/xojelofatenowoj.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ec60b3031e18e53f92293cfb39d4273/fanojitigivuziju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+file+transfer+from+android+to+pcPDF 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_off0000d543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD543 10860 bytes
SHA-256: c45f6d18bd2b0afb54f9d729626a156f2081888f402b8f6a4236d67c96c39257
font_01_sfnt_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 17284 bytes
SHA-256: 6ec90f2471b50ebea646456e7d199352d0c8013ddda666b250d55bb3b369ffd2

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