Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7533b1850ecba77…

MALICIOUS

PDF

97.7 KB Created: 2021-09-03 13:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84d0bccda72c39f72562bd796ffaabd0 SHA-1: 1ef3ff375a0b5db1e120d1020a6daa140a0dbf32 SHA-256: b7533b1850ecba77af0a4c19b1436ddff407623f6a4074da39752193cd43d428
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. The presence of ClamAV detection and ML classifier flagging strongly suggests malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=belkin+av10117+manual PDF link annotation
    • https://srilangkapools.com/contents//files/liwukirezuvava.pdfIn PDF document text
    • http://goref.ru/files/file/tixowazutiluna.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/43475471183.pdfIn PDF document text
    • https://wrd13.com/force/file/74632902219.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/72945616131.pdfIn PDF document text
    • https://badrivishal.com/media/pitaruxusuvurus.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/29246014533.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944c30e3a63---ganizepitik.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/depikizotuxorifipusuk.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/14792044568.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/jobiduwobolurenezosa.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/2pork26uk20vjhp45sro7p30k4/megijikupagib.pdfIn PDF document text
    • http://turnyras.lt/Files/file/81544676172.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/jebolefufiresasuno.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/58926353173.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b1b44b0fe---poremivawimutufureg.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/18349017170.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eea19dde1---libofapuwilumomozoxe.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952963eee4e---9897008270.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/0351ac3fa0b95325f1460d918b9700a2/59467333759.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/92753865008.pdfIn PDF document text
    • http://technocom.pl/editor/file/siwutoxuzer.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/dssh7m9le8cufnk10n93u7qsrl/85206886054.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_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 20832 bytes
SHA-256: 274d8f9996659cf2867046ea1cdaf0224a3b784c81aad5fd1ea101c994ac19c8
font_02_sfnt_off000161ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161EC 10316 bytes
SHA-256: 85226a59bacf92c2556376f4a5b7df053e7728026f32c87214d6887727352813

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