Malicious PDF — malware analysis report

Static analysis result for SHA-256 6266e05b4bc614b1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 17:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f643b58c8fd240f60b58c081c568a72 SHA-1: bf84798ded0ce29635d13a4487e6ae71204d4a19 SHA-256: 6266e05b4bc614b11cd39608ec7ecb54519360db1c7e62ba45421c029e1e03e6
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=wr3d+wwe+2k19+mod+download+apk+free+download PDF link annotation
    • https://sanipacific.com/attachment/file/10292758032.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091221154836.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/43762909385.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/dodafejebevagumizuwudu.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/9787286884.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/resibudukifalunowufifoju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfc728490---13157631974.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/49744594688.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1d141a8e8---63408287204.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/55809748619.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/a7d7d29770e04e2193baeb1a30654403/zepiwedopojojabesozuvo.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/kulolurugo.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/bababepeloj.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/12726096451.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/04/file/98985836993.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/nenegeredigo.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/xisefajaxozo.pdfIn PDF document text
    • https://digireg.at/upload/biwedi.pdfIn PDF document text
    • https://premium-house.uz/images/file/takibemeremixazatawu.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/17996728950.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/83728497270.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_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 10984 bytes
SHA-256: 8b3a0ba706bcd2d3a01f077ced62f65f996a31ca65d82ce0f309103d2a77ca20
font_01_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 17084 bytes
SHA-256: f4648dad778d489081dfc81f0e74cbbe92646013b40e01e32b25b59091f65fa3
font_02_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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