Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8211516d7bef05…

MALICIOUS

PDF

96.6 KB Created: 2021-08-18 14:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d221fe08dd74a3a13f02d8dfd7032fd0 SHA-1: f358ac3a391915b5fd296c928dd2da018db05090 SHA-256: 2b8211516d7bef055a463c48bea34366620c96c305cac1597c30716cc7b66506
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links are likely intended to redirect the user to a malicious site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://guojingmall.com/userfiles/file///pinofizimozinaxubogepofew.pdf In PDF document text
    • https://notrepanierbio.ch/userfiles/file/83097065414.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/vegoxaletokametulukuxase.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/nuxafafukuzepigevot.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/66178718461.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/74319519793.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/207ba77db43fdf810a89b95b36f1b5d7/bunurorisabaviku.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/buxikalu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099171a66336---47639529795.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210729214940087.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c527836c865---burilezuzodobusiselusule.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd78f27913---kizixuzipoku.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/kfhck7c46adll8nslctd3bul52/nobemizamozidu.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/99440280388.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/90775264356.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/2843542974.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/fa2517166e27ce116027ba960081d21a/99535816386.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b38acb5c9fa---93946428971.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/99466227274.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b52b4bd36e---64136038896.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfa142b595---fatomitoboza.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/durilolapojadefomosonaw.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1628671413.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bf337e812---92244463029.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/96982900147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=syllabus+of+class+10+cbse+2020-21+punjabiPDF 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_off00011039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 11160 bytes
SHA-256: 2c74da84ae0df3ae4d60ec63b3ba745f45cdae0bec45cf41a23cd0d0faab2f41
font_01_sfnt_off00012a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001425e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425E 17928 bytes
SHA-256: 29d4f86acda6bdf0b9a267e4da6c5c4aa8cd7cf0d256789cae4e4a881719c518