Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ad0af5740d8b8b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 12:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b70d33deab4b8e3c67eef410fb406ed4 SHA-1: 16bf8256f4dbf14caa9469c9510b25155f651196 SHA-256: 22ad0af5740d8b8b484efaa459379d49a1e46a4a8d8b9087f950b586ad76c516
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9049f13895---zufikolavet.pdf In PDF document text
    • https://duproject.com/uploadEditor/files/9110529944.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a0413d353eff3c3591f02186eecd6792/sawevusurokivobu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/wokem.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/b72c51bb426a52da8e5ac142070089b8/53085615820.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b749def5de7d427ce17c9f1672e1a5b0/68275098716.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/33777052347.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/banibija.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/zegebuxowulanodufofodit.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3bfifl1pj6ab7cbs3947op65t4/93022130752.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/kosusulezovepisux.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/18a35ae363b17d234495d5f2e349fd99/xapuzakekebotobapilulagug.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/vivilaforixifusazetufi.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c207115dde---lixonu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9ovgeggt1p4sdpedt4eldnung6/77137012173.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/17527807436.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/nukufuxatigow.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/wiloligo.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/57530202038.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/judolapizesuberowepam.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/89465560500.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/18772450024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=variable+dependiente+estadistica+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 17928 bytes
SHA-256: 55a66b843edc20bca34f846fc4be790a838230e0624db629cb458ab1fc7d159f
font_02_sfnt_off0001223b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223B 10604 bytes
SHA-256: ba156e86502e604ddbc30bf0e76f151a91f8fa064b37953cbc957d7eb232978f

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