Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c11fb8f2b0174e7…

MALICIOUS

PDF

86.4 KB Created: 2021-08-17 01:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc94fa6b98ea6454c78278dda43bfa31 SHA-1: 39291476a417d016c1366424711fff330dba9667 SHA-256: 5c11fb8f2b0174e7ac250ebe35cfe44726c66e6ef18c32ec3dcfb30d39e054b5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload storage. The presence of numerous links, including one on compromised infrastructure, suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/14096128235.pdf In PDF document text
    • https://proxus.nl/file/1290908662.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/45642759247.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/38164c8959d88fe90c2d6420335adf7d/bubuposukup.pdfIn PDF document text
    • https://irantruck.ir/data/file/noworudolodililexazi.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/xalizada.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/84355642555.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/23876865216.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/jodeginujipivebagib.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/bezutisisuvit.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/supaxatofoj.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/85311897476.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/9174629954.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/61230233025.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d56fc9e270e---weboxowugafawega.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c56453100f764141b13e5b7f73f65c3d/vabepojowawifapix.pdfIn PDF document text
    • http://www.heksan.com.pl/file/85663829167.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/66e54c430683b8692a5219573a21aa93/kixufisidab.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/10924548670.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/sukosewamepudunenubova.pdfIn PDF document text
    • https://penal-garazh.ru/files/likebagamufibelizafu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608648c7e157d---tevozodeneg.pdfIn PDF document text
    • http://short-story.ru/upload/file/67889904366.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/e9b843c622afce56c457af5539c04c80/jigekodeve.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/58202948861.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5dbc99c67---zebavenozenadixulizem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=oral+motor+exercises+for+speech+clarity+sara+rosenfeld+johnsonPDF 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_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 11256 bytes
SHA-256: a63247ed2f38596aedb279718ce275c3241ff9194489723cb1827a24471f9203
font_02_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 17392 bytes
SHA-256: 4f16883c4fc24a21d940c58ab8d8952afbf885adcf90c020807366a0349f0a76

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