Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d83feb1f25cae6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-06 04:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df8737b4815e5c32198ea05904f875a2 SHA-1: 21942bda98b20a8f6e58de7e3116c0b97a35f14d SHA-256: d1d83feb1f25cae68b25dbd4932580f766f2c9fe72fceeab0a5b5048d02fd70a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The PDF structure and embedded links suggest a phishing or malicious redirection attempt, likely to deliver a second-stage payload or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d297e8358f7---lifalakopur.pdf In PDF document text
    • https://marosme.ro/hirek/file/vupifago.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/5166054836.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/dugitafafefoz.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/tuxuvuvimetadaxetux.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/poninig.pdfIn PDF document text
    • http://reichspfarrer.sk/file/45451285365.pdfIn PDF document text
    • https://carlojans.com/cms/file/28096918840.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098acb677862---viwopavujebibapufi.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/bodulidu.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/momigotademulovadox.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120f181bfca3---jogor.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/zazonadowokopinujavaxok.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/xuxuzexuzuzujez.pdfIn PDF document text
    • http://hnspkjx.com/d/files/91607941992.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107140705129309.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/fuzopogesimapuf.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2ade3d8b3---vefozenirafuzovetunuzeg.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070197a4c051---27493185723.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc10b94fa---gofidutilaxogij.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7cd92bc12---kubigivafudonerowog.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768a211a6da---46020601333.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/pevabejiludi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebc4753eaf---31360423221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=history+worksheets+for+7th+gradePDF 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_off0000bedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 16200 bytes
SHA-256: a5f075212d615d011450724a69d75594db96fef4b73c50676a6b52b7dfba8bbc
font_02_sfnt_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 10816 bytes
SHA-256: a9e06007f2f97bbe221e1177ee6f877417d4c4a6dd495abcd32c7117cd9bd98d

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