Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19a5f57f1723613…

MALICIOUS

PDF

92.0 KB Created: 2021-06-25 21:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 33478d3136a63e96e21aef56da43b57a SHA-1: ea701d169cc7c9000c0aa070d82becf9257776dc SHA-256: f19a5f57f1723613d8b2f825735bf187b4f865c4daf983f367981d51f0b95c47
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of a 'download' button lure further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/35b36f06f2ca9948d50aaadf14a5d1cc/20308833100.pdf In PDF document text
    • http://agnieszkapawlik.com/userfiles/file/87132296052.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210602174740.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9e6e72d65f4de5aefe20e60a880b21bb/komugokujofe.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/3ruee8fgnk5i1sql5d6pbdhbj6/94807319610.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rn0jo4oqpok8j0cq9jprvmrk2m/liwopibifojuwiruditidaso.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/jibidoliwapazatin.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/marobibatesaf.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/bixujonox.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/gafekawabevupivolip.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/8rsh1p6tdurtupimli8pk79ic7/wozidujaxozozigoz.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/65a739edc8f52065e9a0e33f57356fc0/95012283850.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0811b32bb---nonezivajifokaxax.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1811d7f1ca---jeripivixogebipu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/05d3r20kgr647rar6mvi7vvup1/fatasepabodapebuxijowe.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5072d677---kopawosejuvexupepedi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608430ee40da8---ponuxitisamebibawabameki.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/rk01dpl6s3heg28a9k0ep22ed3/34325008594.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a7c2a699e---69930418573.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7cb86b4496c88553778de13b05b1d47b/35776442142.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/gobakufofukugakakowodunab.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/wuvazifizubezil.pdfIn PDF document text
    • https://ptogel2.com/contents//files/lewir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=professional+email+templates+for+business+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_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 10900 bytes
SHA-256: 59b90445f20d48359d9ac125223f9f5942a57faec31f0ccd27bda15963f426ce
font_02_sfnt_off00013439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13439 17668 bytes
SHA-256: be5117bef29bc3c899226f2d23d04f61c3c1327f786d52173b927c364e96a8e8