Malicious PDF — malware analysis report

Static analysis result for SHA-256 48de3b3f292fdfd0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 11:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98d0a6db1f5ee064e3b54f45ffe2bd85 SHA-1: 92c7822a892394bb1bd76be82d558632ca1f236b SHA-256: 48de3b3f292fdfd06d886a81f45ad2d32e9e9de48f5f6e0b75e90efb94ddbebb
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a897a2e6f---koxojis.pdf In PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-8-9/20210809222723566742.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7539e916dd---6160908275.pdfIn PDF document text
    • http://infunplastic.com/d/files/pekazukowir.pdfIn PDF document text
    • https://digireg.it/upload/rizidaturatobuzogi.pdfIn PDF document text
    • https://chp-travel.ir/data/file/kokarewaf.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/newipamo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/pupavaxevomukorudi.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/vexaxuzefobufetotimozaxuj.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/3723879428.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/kotulutaxulagepidizipit.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/41093461300.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210725134142.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc41575780---fivuxi.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/87840605652.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/durimuwesaruwerobotedimel.pdfIn PDF document text
    • https://birudongker.com/contents//files/67897392685.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/49902940337.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/839f6f882fa263671bc68e24e76c44b0/fokasos.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b52b15d8504---vamog.pdfIn PDF document text
    • http://strahyi.ru/images/file/531303926.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20218411264654.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/34698158357.pdfIn PDF document text
    • http://humanlitech.com/files/files/45444654121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=osteitis+pubis+pdfPDF 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_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 17044 bytes
SHA-256: d35b981b1b579e7b17cbbe2e6ff2b4e75b08503cef4c196a0e28ece92723a59a
font_02_sfnt_off00012481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12481 10224 bytes
SHA-256: f083843b13facb5c281f6e98d6731e42683d3c693e3617d0e1b1d5a79d361914

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