Malicious PDF — malware analysis report

Static analysis result for SHA-256 1626954914b48a0b…

MALICIOUS

PDF

107.1 KB Created: 2021-08-14 01:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 394d934c75a1bed63459c8b468ad2009 SHA-1: 88f2ce415dc0d6745fea89c08ebfd4560c94e8e1 SHA-256: 1626954914b48a0b40c86d2733b41126e8bc33f72a0e88c40c209480dede4d02
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links and link farms on disposable hosting are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/62462027b0aeea0dfb7bff53ec3d5901/petofixisivuridunolikub.pdf In PDF document text
    • https://bwawarszawa.pl/upload/file/16215246703.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078149d3fd8b---debemedej.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/78559008419.pdfIn PDF document text
    • https://xistenze.com/files/files/50274017761.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608059894337b---6627491358.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160775e67f2906---fepidefoxunosevok.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4ff501eeea02b519161abd84432989a/31587292115.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a392c3d35b3---piredorogudedak.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/gafojodanexututolipozut.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/pewaxivo.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/gusitupogurugavefawuzana.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e49558b4f2---reraka.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/lemenar.pdfIn PDF document text
    • https://yuss.it/file/lixaviboboxun.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/vppa3kh6gn1euvrko552lr40u3/4582148788.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0430d3c017f2c2d79273be207824e63c/bonikelalubatevobulokatep.pdfIn PDF document text
    • http://ipceurope.com/assets/file/30021145604.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/27469405cdb999fa467c19fec988c71a/vavunekoguwufipuzuzo.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0b76055e1---fogumabunene.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/bajegevug.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/xuzizu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983eec3a95e---terekakozadebar.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/96984447866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dog+temperature+while+in+laborPDF 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_off00013db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB6 10860 bytes
SHA-256: 182177f2e199e43f8c44142e4d9780d813113f63779c12a8f72c723ba79fa55e
font_01_sfnt_off00015666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E78 18196 bytes
SHA-256: 0fc70f7a8026740bcbf24389622ac8aeda4f2c0818b8d1b53357563f70c8f776

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