Malicious PDF — malware analysis report

Static analysis result for SHA-256 d228e364d166dca4…

MALICIOUS

PDF

94.2 KB Created: 2021-09-06 00:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ac98ab6ce202e6721d6ef55bde23c2a SHA-1: 4637bcda35fe2a60a20fce2792fc4b69cf56f3e1 SHA-256: d228e364d166dca490880aa3a0836abfd30bae691bf13445f7fe6d01bdfea345
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to distribute malware or phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal being to lure users to malicious sites via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/dfd1b61287a049bdc1c31d0f99a593fc/riwigubel.pdf In PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/45141039089.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/75922474807.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/afc100011c3e3b31d6435594ae6a8490/palotawanaxivapajavoduti.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/gemuwexuredofoga.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/kevimidumenogupinapol.pdfIn PDF document text
    • http://clingac.com/d/files/xemoka.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3ea4e650d---gudeganujaxujalopazetano.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/misivodopemevatazedelimit.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ef92fbfc4af9ebca709a43893183d44e/98566735628.pdfIn PDF document text
    • https://blv.by/upload/editor/files/36880912923.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/5cfc884fbeb155c88279c2f8a63d8525/gaxilabotewamununi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/dunoxutuxur.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/dd7c7dbece1cd8fdbce8923fc16399a5/13926879408.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/87746847106.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7d34461bc841a19396fdefee4c6f56bf/morudupasegavasaruxixedep.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/76446177411dd756d2442e9d80b0a820/lilewaxupulibugakida.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/28e2a56f53518e9afce7f5b01db00191/87062906921.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021718104367124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sometimes+you+win+sometimes+you+learn+summary+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 25184 bytes
SHA-256: ded31adc16d851c369a14cbaa7d6e57f45530bc66eabd63a2457f119469c972f
font_01_sfnt_off00012132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 16580 bytes
SHA-256: bd48a706557195532cfff6430114565602ab822fbed2b26e66d7464fd6b20bdc
font_02_sfnt_off00013872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15089 11032 bytes
SHA-256: 24c5a4e69da949ad2e377ffef0b560bed193c46846e8811d33d3155a337caf80

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