Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ecbbea90e4e3c8…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 09:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1fffeda80880762615e01cbc89f96eb1 SHA-1: e074a19fc419f17416af6892c5dda4919f4f927a SHA-256: 92ecbbea90e4e3c80687ce682abf460e9d3244c7c9ccf93d20656d49a9053355
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded URIs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=custom+calendar+android PDF link annotation
    • http://levakov132.ru/userfiles/file/givakixipazivutagunofijox.pdfIn PDF document text
    • http://innotack.com/userfiles/files/30302452010.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/16537279019.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/21030515495.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/24640465808.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/nareviteviwatixalusujat.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/30376046138.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/lozole.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/39014565829.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343cd163d85---korotalugukuwiremukomoz.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/c2ae2333463b062f922c1d9da1fe4261/32588128328.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/5573109657.pdfIn PDF document text
    • http://3asoft.vn/img/files/larujevuvijirow.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/88684272791.pdfIn PDF document text
    • http://elektron.be/public/userimgs/files/jovewamebed.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/pokuxevuxulumakuvofudok.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/mujuluniselotuxonufit.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/letaxipexebetozizilugav.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff2d116fbd---43832355085.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/49469498552.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b2c2590b1---96147346481.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/28647470518.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/71009287382.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210916112913.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_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 10664 bytes
SHA-256: 65dce1f998495f554c51041aa260a82df641cc8ef56e47688c7c39ac068c8ffe
font_02_sfnt_off00011815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11815 16928 bytes
SHA-256: 21d1429ae49f931621a70b0f821f6ba4796eade15b2332e11e1eedc973480f7c

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