Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f3c2425a0a3963…

MALICIOUS

PDF

157.3 KB Created: 2021-07-14 03:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 865b5f8f95727dd151f077c2ba9b469a SHA-1: 7e94af66c628a2b1b1167aace91b244f1738aee0 SHA-256: f5f3c2425a0a3963560d51daf803c601314bca0cee175e18301ab4098523b101
156 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 functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of external URI heuristics and the compromised CMS upload link farm heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

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://crewmak.ru/uplcv?utm_term=stamped+from+the+beginning+book+pdf PDF link annotation
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9eccb4ba8---17606575660.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4db9869a---40117210683.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/r68f4vd21vg2jo4l0vga04go99/visoletibatobibifixemelal.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/63829400687.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/8518284848.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/mixubefepodokukutug.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d70f8c1fb---fulazemodezo.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45c03b513---juvedoxiv.pdfIn PDF document text
    • http://goref.ru/files/file/kodoxezekajikawogogapaw.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a28169268---8641808643.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4e020e1440ea561842ac847875e288f0/lexazujolafogowukapizov.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/20bcedef2fa0008d816b806978cc1065/nirapi.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/67915319545.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34c5b5155b---72601611555.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/jigafijinepejalodazasam.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afad5084e6b---rabevowijezomiwe.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b171e8b6931---petikaxalibipumukof.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/92532548695.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6a0657136---88675772259.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bce4c9e04---mixusowibulekobowawab.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8dbfb6a0b01a9751b984b272e19c51a9/dumuxujukasowoje.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/nogadutevis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e41ef3c77---37193154021.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000206bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x206BC 11040 bytes
SHA-256: 8986c0ae583f71071d5c0370a4d82f491bab04c857d9ebd23ba60229d68461e9
font_02_sfnt_off00021fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21FC2 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
font_03_sfnt_off000234d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234D1 19308 bytes
SHA-256: ea855788713491c7398a94ee51b7d2baa4be148c9d307cb041c46b06ba580639

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