Malicious PDF — malware analysis report

Static analysis result for SHA-256 3864dfeb61a3055f…

MALICIOUS

PDF

76.6 KB Created: 2021-10-07 05:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 795f13ee2d0982ee7cfc5bcdee709d3b SHA-1: 4e7daaed99ae821857afc94186796bd7628ec7df SHA-256: 3864dfeb61a3055fb0735d1e670c18cc000f8b4c2ed8f6a088753442ea3b0664
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://icsbc.ru/fuploader/file/dozisivapunofakurowasejo.pdf In PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/tolekokuva.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323744c290b---lemelujejiku.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/miwawesofe.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/loguwomabikifijewa.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/43954033137.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/gajarodopap.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613742f00cb9e---vegado.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/jobinuz.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/mitutijixukulososelo.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/crn9rg8tqcqq1a2v6r0a0ao61l/vitaxadojojutupusemaf.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1615b6ea0dd3f6---69151925149.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/55106856106.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/97606703763.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/womugezejidurunanak.pdfIn PDF document text
    • https://mkontroll.hu/File/62732522611.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fdf91a7578640c919e9446be3a57eb53/44154885479.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/limefifagonul.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/lagikivixikevosutekirog.pdfIn PDF document text
    • http://chamaeleon-produktion.cz/www/files/file/wokesazabulovogurelubo.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/29980679568.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/32bfb2f8cca312dbe2c25da67895a9e0/jisufaguxapimejezegita.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210919170548.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/80026636555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=basic+os+concepts+for+interviewPDF 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_off0000c8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FF 16932 bytes
SHA-256: 1eca3e34e5ef160c7f446af3eb66d27c88ccbf07355558611ea93907ab3a465b
font_01_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 10632 bytes
SHA-256: 4c71e592bf82d97a8835fe4f488cbd6e7d6189ab10f1a9b755b5f41499b014e2

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