Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db331b3f5e3a6a2…

MALICIOUS

PDF

74.2 KB Created: 2021-08-28 21:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73263dc622088aefbd5e9010a6257604 SHA-1: e121c610fb38acdba123f407e2276ea7cb3f486e SHA-256: 1db331b3f5e3a6a2c4b13103fa18a16ad19fabdcbf7c8275f226df89da546b2c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://progfin.pl/userfiles/file/xafobumozulumagokuwopumov.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/aabq69ni67apaq05p53n9jbmm6/71782079922.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/67333525641.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823e0e094f7---febotutokanixasewukodofe.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc841bcd9---weliramiromafivedoj.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106300522263234.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/74976817794.pdfIn PDF document text
    • https://hearing-outlet.com/uploads//files/202108040314562801.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/walekapajitiruxapibag.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124b7289c3fa---19104242073.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/20984579898.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/dinaniperuvukonukonenibi.pdfIn PDF document text
    • http://kustari.net/userfiles/file/91984145287.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/15998318357.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/pagumodamivegij.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/fexizukemadoli.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107fcf9ba72b---ritegotulerusufame.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f661ecc6a---2990582955.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3939a45392---kezapexujafas.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a40921e1844---vorasuwujux.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/9745272243.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/61a3keqr82f6o1n5sasetbdclr/35767719976.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2205e60bba---27322643621.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de82439c815---95548706523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+levitate+in+controlPDF 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_off0000c0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 16416 bytes
SHA-256: 329c706121c5214c5119a6c4811a49fe8aca9d4173f69d2a190823979b1ac8ef
font_02_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 10380 bytes
SHA-256: 13dfa3120e2119a6a0873ccc44121cbb3b2bf7e2d370f04d605ce93e877e5395

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