Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff01b5f9c57f807…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 02:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76cbb646f2e616fc99967f44a45abe5b SHA-1: b0a900756cdd1787fe9914c790c6307879cef842 SHA-256: 2ff01b5f9c57f8076e58ae466c3ec0062b20b9700593a40890fe8c6f7326a029
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan indicate a likely intent to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://gzky.cn/dubeite/ckfinder/userfiles/files/20210614_074711.pdf In PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/12882239243.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef9f8fd4e---68020632076.pdfIn PDF document text
    • http://broadmoor77.com/clients/39738/File/99039906272.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/kilotijidozodoboj.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/16413958078.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/pufademelajagu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/60d37ecd41ac432282ecbf9d9fa0f7cc/4682205895.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/muvonobaf.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/27746076371.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/fefewobubuzi.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4421b223b3b62ad8da766f5106a994bc/49321212454.pdfIn PDF document text
    • https://petala.gr/userfiles/file/webogoget.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/sedorofumesefajox.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/10134714092.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/cf24f6396a736479038b4804c647b708/zotopanelisijojanukirid.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4d6442953---jugesiwatadoj.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/fd5bf3695a9517a385519fd89d2fd1ee/wesuditobewekalow.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/3be1650fb67354a68f4b0659cdbe941c/dogoredalanenudevasamiv.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aaadd278117---31061571835.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rp4rd0f5r4358jp464q93m1lct/popopofurubalu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/0fd885cb5579ac8ff1ca6f3949def0d6/89632328029.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/viminepopokikomisa.pdfIn PDF document text
    • http://wphs67.com/clients/9/95/95f8299e8098c1f2c85aab0f7ead5e97/File/murupibexuzuvij.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/jazawakeladasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=vivoactive+3+manualPDF 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_off0000ccab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 16840 bytes
SHA-256: fdd37ca3abdcfff70f3a4e5cca406240082459be848061d9e5f2b40b3c79dade
font_02_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 10428 bytes
SHA-256: 2f7eb4b632632dc39ef1e39588fd92e7efc9712a93f0d6d9fae6762da1a8e3a6

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