Malicious PDF — malware analysis report

Static analysis result for SHA-256 60c377d0136a7ec9…

MALICIOUS

PDF

71.5 KB Created: 2021-09-18 15:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69f7c0d1445d9e56c03e219340e3fff0 SHA-1: 822eff6b0e9f0c2acef7818d88bdd6bafea50eaf SHA-256: 60c377d0136a7ec99fac618bd5e0ca66a2a80b8b59e9225cf99eddd1892e0390
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high number of external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a download button lure further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://transcash.com/ci/userfiles/files/8453881353.pdf In PDF document text
    • http://3gr-group.com/ci/userfiles/files/8585237559.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/domumafipatatixuguxogi.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/2537515212.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/sajuxuwibaxibukex.pdfIn PDF document text
    • http://recrute.fr/files/files/daruxunakexofaxadima.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/20889386284.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/kisuveruvavakoj.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4a3d9282c---degoxaxul.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/kozafowivixakiwojen.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/8247688485.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210904072225.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/ritezavased.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210914191447.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/mujotugapewutelaxo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/2d1ab21c828f1173f68e2754dfa6b3d5/fukepesokakiboginu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c182ce1611---tevonufanuki.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/58995467634.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/9108026392.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/rubilemiperaxikasezubaf.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/89270643322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+power+of+now+bangla+pdf+book+downloadPDF 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_off0000b4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C1 16800 bytes
SHA-256: 4cbb7492e0313993d053fd4846fd2594beaadd122113676f791d6710f07f7b43
font_01_sfnt_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 10700 bytes
SHA-256: 661e5da6720f3746ad9be612ba2ec021ca5e5e9d0c61c803a7ed5dd100e42b4b
font_02_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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