Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a06ac2b77f53c99…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 02:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23a90815af0a2c0a0e8d816ce30946e0 SHA-1: 984aaab9027e7c7328b3465f675641e884d7da38 SHA-256: 7a06ac2b77f53c994a738df147d2a999d2d174585af24fad499e0c34839be5a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites. The presence of these links suggests an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=tafsir+jalalain+arabic+pdf PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8cdf233d4---gorimadatinizusapatebu.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ec8495ec5---legoxonibom.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/34496268929.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95d584ed4---rebukusexevevovakegejapat.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/kugozesireponawukenowifar.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad6dd0089---gulefexuzebatuk.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076b6db5375f---nuwepabate.pdfIn PDF document text
    • https://aashianarealty.com/file/69794546778.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e251ad7ac---fepote.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7405eeb75---22151152083.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jajonujoxovadinigivubegem.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021062807431680554.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210903_035540.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e31f402522492706ca4c60f09cd2d35f/10869220568.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/rabirimife.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160adad3a8208c---23543843534.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/256a712e93e5e93aa4567ca7edacd116/85371300460.pdfIn PDF document text
    • http://jfe.hk/userfiles/wojebaxemulu.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/koxik.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/31806266249.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021819836267828.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/13195668435.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/xozaz.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45f1f39da---13623792324.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/pixebilopupezuzimanomege.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_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 10496 bytes
SHA-256: 642168ba8cacd7c8a1e9a5f9953d7bdefa6349882f4fbe52410cef62f694d4c1
font_02_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 21724 bytes
SHA-256: c515e45d6ddb2b436a387417b247f5bba37d3a93bc0880efe239293d0a6e52d6

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