Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1baf8c9a9822e61…

MALICIOUS

PDF

71.7 KB Created: 2021-09-03 02:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc84f4d7e8200bdc6be0663438d87741 SHA-1: ee9e319ec3021cdca6606ce144ea2c5d5c398a10 SHA-256: d1baf8c9a9822e61ef887a477dafbf5b3472bed64038d39171dc22050cf6da60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised CMS upload directories, suggesting an attempt to host and distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://ketchas.ru/uplcv?utm_term=the+skripal+files+mark+urban+pdf PDF link annotation
    • http://beautifulmoda.com/userfiles/files/xibovosetosavi.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210810214937.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ffa80c54c---vadat.pdfIn PDF document text
    • https://iwistw.com/upload/files/kikulikarakavira.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/95780886609.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/88988824368.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/36448129115.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6321c34bf---94860945223.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d7d765f25---gijepidolutumuvafuwotuku.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b451446123---19025220651.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/61779726801.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/82083848061.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/tuxutodidamonadanuxajed.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/sibar.pdfIn PDF document text
    • https://braus.uz/images/shared/file/82955162785.pdfIn PDF document text
    • http://keacg.com/upload/files/xowed.pdfIn PDF document text
    • http://hephatha100.com/clients/4/45/452f9a9cd3514f90eb92b3b4734a1f1d/File/nepenagufuposer.pdfIn PDF document text
    • http://strahyi.ru/images/file/siveviwub.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c785aa50ba0---zedovifewu.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fe83b3e14a8---jedafetakoledojuwofilam.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/nesufaxulovexulawezup.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/48857710984.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/patojuwubi.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/51668588777.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_off0000b3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC06 17536 bytes
SHA-256: d890822178d8f4bdf7b462c97d9cfcc47c1471a7732c2336322bd3caae79c446
font_02_sfnt_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 10840 bytes
SHA-256: c2bd8014c42b58eaac5fbdda4397ca1910c7ce5e70294e56b8737ab87f44db88

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