Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c75c9c12e01eb09…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 00:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a039dfd97c5378a6d6ceb6b218ef3f0 SHA-1: 7feb9b8e1cf2f3af9b9dd2d72f97072703b9063e SHA-256: 9c75c9c12e01eb094eeacf9353487c8fbfdb04496de4157500eb1b303e360bf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The primary purpose appears to be directing users to potentially malicious or deceptive content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://turnyras.lt/Files/file/64219231822.pdf
    • http://kimhoatra.com/upload/fckimagesfile/89469123108.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad615cbf32---bunopuzu.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/710f5a97d336ebb4fe675e87c584ccbc/56874604409.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0095f3ec2---70313683509.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/taxujuw.pdf
    • https://saam.vn/images/content/file/nebuze.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b69f9196ed0---fepoxemigesotexate.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160701f1f24808---subupesirupi.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab89a172974---14077645082.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/2732399832.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a170a221bb2---92649399190.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/4481ba62e92a8ec4d3316206f2ed4f17/35560921107.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608069a09bfee---17897294132.pdf
    • http://mppscstudy.com/admin/usercontent/file/madet.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/55nr9f0livvksft8jsnpmsn703/jubaxo.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d02bb28ca5---vudirewaj.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/e033221b2f85ee1a84927a3a7fc7ec7e/20818491897.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/74858089106.pdf
    • http://automsystem.com/UploadFile/file/20210510194931553.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/o65skemm5mh2811fon83cr0t62/26462083936.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/mk2qlouuikh25mscng0v4jqq47/dofobavuxaduzarekujili.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1almg2df3q1pgsnsap1k6gqho1/tenalofijolub.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/bc6c04e59636abea9fbe7604281f5064/wusapamapexero.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=famous+singers+busking
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef71.bin
359fb20a0ca45cc9daa4f32477b5f3580c4f0284f8497bcd4224bfa1a31d0aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 17712 bytes
font_01_sfnt_off00011d9b.bin
ae5e995b60a4d3fcaffe01a1f6bc3c01ff15c87219c69435d8ae3b6779fe9447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9B 10616 bytes
font_02_sfnt_off000135d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135D8 16792 bytes

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