Malicious PDF — malware analysis report

Static analysis result for SHA-256 7101a6c9153c6c52…

MALICIOUS

PDF

78.5 KB Created: 2021-09-12 01:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dee12b71b6d94d76251c3a65a666b7c1 SHA-1: 8b70355a7dce43a03182670c59189aaaef2d6e12 SHA-256: 7101a6c9153c6c52fe668aebf25df94212e0a45154dd8e85b6ffb13548376b31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://coretry.ru/uplcv?utm_term=cosine+graph+equation PDF link annotation
    • https://china-glass-mosaic.com/userfiles/files/20210908_045631.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/231992413.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/33256823295.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5b5c507b---15872411146.pdfIn PDF document text
    • http://lex.tj/img/file/zixip.pdfIn PDF document text
    • http://email-database.info/userfiles/file/19696844645.pdfIn PDF document text
    • http://ch-yang.com/upload/files/28799336425.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/sesefidixozoti.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/45881958254.pdfIn PDF document text
    • https://jagominum.com/contents/files/6872164129.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16137e44907200---57111695196.pdfIn PDF document text
    • http://lovesenergy.com/file/kubiteranuzes.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/roduxefilimevasogexeduz.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9cqosu6ac9rufebfhaj6plt6i9/miwukexobonu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9c6b507e19f5c064cc40af64baf18e03/34643791304.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/zipozixijamor.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d00e1a20a3df714ffc5276da74aab17a/dajaxo.pdfIn PDF document text
    • http://timebymtm.com/upload/files/52304588102.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/josatenurobuwun.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613549f0d1e1c---rediwimi.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/21298785757.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16135924d496bc---11493788472.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/gixumajexodivazevurifed.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1adcada60---pawexigovopowone.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fac3eb095d82dcb378ef24ca0fec28db/89944681330.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/75715147585.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_off0000cbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 18444 bytes
SHA-256: cad4cfef7056c6cd8b52957e7bb8fb9cfd72eb8d0420bf1973bbdd5c37d0a5f5
font_02_sfnt_off0001143f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143F 10764 bytes
SHA-256: aecd07dfad7a5aa076a9ab5aecfefdcc9f883b6d66e486683ed7300515e51085

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