Malicious PDF — malware analysis report

Static analysis result for SHA-256 0221c7771a8007af…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 20:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7786ffc35d2dbc6a729610c43665ea71 SHA-1: 1323c4a0ada488e188b5f942c8bb1f56edeb7053 SHA-256: 0221c7771a8007af8b251f65470e706dbd0ff5f84fba0ddc609c5e69f1c90226
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple compromised websites that host further PDF files. This pattern suggests an attempt to obscure the ultimate destination and potentially distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://prestinireedcorp.com/userfiles/files/rugekot.pdf In PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161042553cdb40---xalalumawakogukolalevot.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3c125ec5---sogigosabefuwepabus.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/44289195215.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16111cffa386b1---5812696135.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/rurenoverodezubozamuda.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/79450357686.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/60684627627.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/80820504666.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c9ec34ac4---rutepojidefezoguwojalepu.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/59657178230.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/95763622320.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/modefagosinat.pdfIn PDF document text
    • https://dietacud.eu/upload/file/3204978296.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160913481910c7---wasot.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/80227353276.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16088e67250273---karinawufiroritenume.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d16c6b9b---9632291202.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bcdfa1945---tufozulatedotug.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/u29cq88utn9tspge865cjdq9sf/kuwil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=inhaled+tranexamic+acid+for+hemoptysis+treatment+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_off0000be68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 11052 bytes
SHA-256: a40d03ec5f642afa30d81f1e3c38958d739d04e2cb44fdf6c07994bcdf14db25
font_02_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 17176 bytes
SHA-256: 0fe56e23b493ce6a7a5a2c557de1c273a48bb936cb196e574986ce8da0fe8e88

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