Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bf020db5a3b9e1…

MALICIOUS

PDF

85.6 KB Created: 2021-08-17 05:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5b8e07ac66f609638270081b12cc0f63 SHA-1: 1c6a25e42a17c1f7adc04b24a622508c1b4cc1b8 SHA-256: 71bf020db5a3b9e12de9a265d376d64d2441689339bcc4c32125b2517c5603e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cayxaotamphan.net/userfiles/image/file/23135662958.pdf In PDF document text
    • http://synthecinter.com/userfiles/files/rorikekefewuxazivazuzotax.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/vebeluzegubaguboje.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608797d371872---badunuvogupirulego.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/bojifumitewun.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/dbe3178bb5dbfb210457ee65926aa624/76528904687.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/fb796f982813c5eb08f8285526a96ab0/tilokabekojovujotukububir.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce172bbae7b---36292076570.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/18417849078.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab8b6a489---berokigixelan.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/71715051232.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/84197184596.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160845d4f973f9---modumirejejubinoxiwuwo.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/84103714272e9224e898791a251a6622/xuxekosajugikuguvuluburin.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/43032353905.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/539633f829bfe7d7465d974a7dde6a74/12322304889.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ug8snnhfrff7kmtdbm5ndjulo4/malanatefevotamu.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/dizowokozirareza.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/murixupidemigebexipara.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/33787096142.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bc2038288---jidukuwogafewabafonojaj.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/47090075364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=lettre+de+motivation+candidature+enseignant+vacatairePDF 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_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 10788 bytes
SHA-256: 6f4a12a87f1b66abd4d45c1e84f7ad3ac30ccae6ec2714d0ee5cae823bb14be0
font_01_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 19460 bytes
SHA-256: 69aa30519bc4d8ee19016d1dee3cfad64c86e94c471f3725bc16474f070b8afb
font_02_sfnt_off00012e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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