Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a20c21fda45565…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 10:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36de399192f14ce7731e111540e1607b SHA-1: 5520077014734a7810a32c5d185f5f1f53bb3e1e SHA-256: 48a20c21fda45565c8541b563bddbe9fc761e003c818a3225a3b7e0ea681aa79
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, directing users to numerous compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of multiple external URIs and link farm indicators strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=the+norton+manual+of+music+notation PDF link annotation
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d049e63401f---79851474933.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202107272329123552.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/lozopedaze.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/18052685697.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0385e7e546---81622383347.pdfIn PDF document text
    • https://onlinendttraining.net/files/jezabagerelepunevisubug.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/53fe2c6b0e3fd13965c223ff6b5f6fe1/samaberazenabofal.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/sevuxaduw.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b74cc36dc---bisiwakalixugukipijafuv.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/41852335708.pdfIn PDF document text
    • https://2acontractor.it/images/file/jexalaputadamuzajigalos.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/mdpt52olq3e1ofe3va524tptr7/nozuwujefixuvaka.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/gikoxakidamenaxuwubopopod.pdfIn PDF document text
    • http://teplospectr.ru/images/files/tusewenikisefeseziz.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/19413318498.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c9be56cf912cc71135bba81a2626d5fb/17436206230.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b955f36d423---52409884055.pdfIn PDF document text
    • http://theponghop.com/upload/files/77458096988.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1627189258.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/98871689849.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/59542840630.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/otg0pa4uo28g7eb07r5nhm5ge5/4155283416.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/46874601124.pdfIn PDF document text
    • http://getem.pl/files/file/76052243780.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_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 17508 bytes
SHA-256: c3bffbf6e8e42ef37724c3bd498625e16b338006130f0aa4c11b5f7bf3b7a688
font_01_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 10664 bytes
SHA-256: 6214da4fa5634cc8f1e8b14c7709ea7c5938071c1808cf78b097b11eddeedf48

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