Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37f0048760320f0…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 08:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f45902d92a442e25c9d8385510a74c1a SHA-1: c62b7ed330e1c99fc85c70d883c3ac360fa02abb SHA-256: c37f0048760320f02500a4f8580a73f201b27728c874fc6f78550795c8d22461
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://catamma.ru/uplcv?utm_term=persona+5+royal+best+weapons PDF link annotation
    • http://yuhenganquan.com/userfiles/file/20210703083744_126171474.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16229486043636.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/58736128579.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/32087085613.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/n77q7a2magmhc56269prb8k8p4/pijowuzixasufidemejafo.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/708a444cbb82dd68462847fe9a2b96ae/punifiwazed.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731a79c2a7b---90516431200.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f55a74fb---nidevezebudidijusik.pdfIn PDF document text
    • http://handgun.ee/media/file/lokumoxutevu.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/vesikamanoraxuja.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/40404767263.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68b456fdf---82502335462.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3376b3c2d337d5eda75ff3843bc49ef9/damonetamoj.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/zikewaxosunezepomuliroler.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/vokedotibutamivomerip.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/91580172883.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/0117e33ecf6d9b9867cd417f12a38139/7072561967.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/pejufegibuwasinilonadufes.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a777412e59f---29296246706.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/17ttc2p3689pife6rjqv2eepsk/38053634003.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/60090531785.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_off0000c196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 10628 bytes
SHA-256: b166c319129e50915734c22e2d339c6d6e72edee3dabc546b3d7cf17bb1a7776
font_02_sfnt_off0000f217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 17360 bytes
SHA-256: 22a12b66e5dd2469685f534d19cf1f82337a78a73d4963152db4d74fa2513f04

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