Malicious PDF — malware analysis report

Static analysis result for SHA-256 52631584ee54208c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 02:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad2d135d4eaeef8424bf396080cc456b SHA-1: 2adb3c062294c74dfab7a5f5b9049d5063a89dd1 SHA-256: 52631584ee54208c81788247c8991d98cda62f55d4cf87808d43c9649a7cc133
164 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 an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, suggesting it functions as a link farm or a downloader for further malicious content. The presence of embedded JavaScript indicates potential for exploit execution or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/52391982001.pdf In PDF document text
    • http://massintech.ru/img/outer/files/wigot.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/fujazulexaze.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/zuwamaxawovix.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/9749295625.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/roniriwixovovinajomamubig.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/xizokujojusavawisiwiz.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/78839023695.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/9971923838.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64c60511c---30411411613.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/11808911798.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/3c88bdca186b75ad017e5e03997a97ad/boxotobozizinegu.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/zafabepi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ac0dca34ae907603f4d3aeed7adfaa5d/jaganifatufowut.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/sosuwenamovedujavod.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b2a17ab93---wavubewowerejexuno.pdfIn PDF document text
    • http://safarang.com/basefile/files/sujarubofun.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e233374953---45276575787.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/4j94qhca1j6igi4k3p0e60b245/41432031845.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/vibivateposexoridanipos.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/10481939348.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0200ad2324---butunidolemakamezalu.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/bbd8p565r47dt91edqggdt759t/rojarivamirasubu.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/nusumedubibivabebukirogen.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/52qk6g3duu8c4809uui26utngs/senuwumexap.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608129dd5005f---gufuzadukaweresol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cours+de+solfege+debutant+pdfPDF 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_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 10852 bytes
SHA-256: 76a7b55ab71343697aeb45a2121ea9d750fbcbff5630adbb5bd7a6c5d6071260
font_01_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 19628 bytes
SHA-256: a61acdd70cf1d1275fa58393c9cbef6ca9dc5291bb904b74956fb58f2915ea4d
font_02_sfnt_off0001283d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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