Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e8e701e8e60f3b…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 04:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae778c0bf8149ab396ad08cd45ff192f SHA-1: 43e364d098868078fb93a8e20435bc872247e156 SHA-256: 73e8e701e8e60f3b980f86a5a70b2fe80b7f895416b150e8c22bac40fb210e90
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains used for link farming. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI links and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=how+to+write+address+on+a+courier PDF link annotation
    • http://praguetransfer.com/files/file/kuzadukuje.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/mopok.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/pozizewaxugi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/j5ii2l95nmkjvpqp4r19hd0ac6/sosaj.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/jupixojobavurekezivenu.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/32453810535.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081191fbc1ff---56151280777.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/28516748541.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/xigul.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/44038745051.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/2854926163.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/67211408027.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baeb0bdfd98---85904746813.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/kefolakiwesojux.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18794582e---salufulopoji.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/22178507075.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/38723338741.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/21679674641.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c4834bd4930---vewibavitej.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/neduleganepazotutejanuko.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/99d0dd52250ed51665cd58e55d024abd/gakexofaxetaka.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9585c52af---wiposusokozijemagup.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/nataligukodeje.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/gik8u2b8l1sihg8fmtcte6f5e3/nijovawu.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_off0000c59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59C 10492 bytes
SHA-256: d923a1c9a9aa67c95408a92510ca6e7572e3247e250a84df1a5d47c69feafb3f
font_01_sfnt_off0000dda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA1 16204 bytes
SHA-256: 0f7b60fe83da64904f710fd3fff99e248d30d46f2f55bab6965d1b6fe92a2aa5
font_02_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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