Malicious PDF — malware analysis report

Static analysis result for SHA-256 114e639e2e9a1581…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 18:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4769179071961dd040e78e12b4b20fea SHA-1: 28d767ffa481eec8a7aa95a7299de66fa81ac3a9 SHA-256: 114e639e2e9a15813fc7917895f932bd7d46cca902052cafa340e7f6fdb80855
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external links, many hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of a 'Download' button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=sbi+exam+calendar+2019+pdf+download PDF link annotation
    • http://vtvxm.vn/userfiles/file/rigizamapotanogafag.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/molinagutosagogigenukonu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d95fce87de---31426442634.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9138e42b66---86611476232.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e4596910b08---xeragubemamegivevizadi.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/mowonugo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160daa05ce37de---37597525487.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/75578108953.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e2d72b58d33ec4378ef901830a67f55e/25993965439.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-17/20210717092059323119.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d6098940c548a35c1e4ae0fd3d4a3cd5/retunojagusenewogot.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///55052929475.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/15934080079.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/pumavivasepux.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0d89661d8df5443e802f1b357c1db8bb/69021328473.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160778a0b3548a---buzelifitefivizopiso.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/bulasateredapakatifabu.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/44958879756.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/14627266788.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7c9c7fbef8647dd62d8d3e259f729a1b/zodobetinipotewabog.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/77029241222.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7dbbbb869---tigubolawe.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_off0000da59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 18144 bytes
SHA-256: da82717cfbe842655fb5a042ab5af320e199d7f0f1cef05d265092656869c556
font_01_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 11380 bytes
SHA-256: 4e65f84f93d17fac477e9066a4f0af708b344a7e809e05bfc015873577b382ee

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