Malicious PDF — malware analysis report

Static analysis result for SHA-256 28628f235e59a041…

MALICIOUS

PDF

95.1 KB Created: 2021-10-05 18:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 67e96dd757424b1995a48c22f5dbabd2 SHA-1: 1a6b4d3fb54f56fa081b550de5295ead0014c7a2 SHA-256: 28628f235e59a0419d4cf384ea5d63ea1f3e072448d6b02d9ccabf45d0fdc672
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to potentially compromised or disposable hosting sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URI patterns are indicative of techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://amgaa.org/temp/files/78584772161.pdf In PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/ratrmsd7db7q4h2mg398u8c6vvhh1iup/bisujilimagododezadi.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/dixurabimuropifejodimibe.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/dorig.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/67807503861.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20211041010261663.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb159d9f4e---ferefoxuku.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/fesuxabov.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/61824338786.pdfIn PDF document text
    • https://partnermind.cz/images/files/kawemalosudakuweroxijepof.pdfIn PDF document text
    • https://nexapos.com/upload/files/47169401617.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/galoruj.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/93187223369.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/naxuwa.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/60797182613.pdfPDF link annotation
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16153d4dcc6bfa---74867779634.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/11362431998.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/57991339439.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20211005022117.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/jajoleso.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/28323656213.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd75a130aa---27192498790.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/zovidokezasaxojebuwuwoz.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/buzupudeso.pdfIn PDF document text
    • http://pvvc.cz/files/2117161507.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16155c22c1afde---kezujogapikaveb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=types+of+funnyPDF 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_off00010f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 10028 bytes
SHA-256: 6bc41b6c4a687d43b1ce513232df3fc99afdfc5653c63741a12a55eb77bd185b
font_01_sfnt_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 18844 bytes
SHA-256: 8b3a71a3ea087baf80e7b839ef2b178526c2706c73fb49268ce90511521d8e85
font_02_sfnt_off0001572d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1572D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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