Malicious PDF — malware analysis report

Static analysis result for SHA-256 2291f7053312568c…

MALICIOUS

PDF

102.9 KB Created: 2021-07-06 22:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9628ee8a24d81763ca107f38525af8a5 SHA-1: 6c0e1ee8d4688aaee622e22ff4419261fda777a5 SHA-256: 2291f7053312568c62463216f78f0e4afa3c66a3ff3a7f2b40de25a3abd14ea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://pistant.ru/uplcv?utm_term=example+of+enculturation PDF link annotation
    • http://www.gabrielamaciel.net/images/content/file/86166896812.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/xajoz.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/82275263191.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d5613f34b---66794472039.pdfIn PDF document text
    • https://ancoraeducacion.com/images/wivamevabuvawokiziv.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9d13445a---luteteb.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dfda8f87c---67310276753.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/binipodelipopove.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/96399751916.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/p5r41otp65frnvsv3n53t17nj0/26305677228.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accc50ec214---36907632063.pdfIn PDF document text
    • https://datajournonepal.org/files/68052328013.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c77788685d8---guwagan.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/6746014713.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/81234159783.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cb9590f022---67711618430.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/88434c5e0e8052ffb68839dcade61cdf/taruzikunetexopunupi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1b68e5160---33425587861.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30168974722.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/risanovi.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/7d5lj29v7e33lj7obcommp0mgl/22934339038.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2676ca595---lojerinetefanuvimirabivu.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_off00013477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13477 16512 bytes
SHA-256: d7dc05d1f221663da6b61f0b841e8ed3d066ff910454c411c5377adbe81acbdb
font_01_sfnt_off00015f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17734 10656 bytes
SHA-256: 0a9c31d5b8dc8fcf0bcb2a7efc1e3db2e505c3ecb708fe9b8a4efe66a9de955b

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