Malicious PDF — malware analysis report

Static analysis result for SHA-256 c497a9a641451952…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 21:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 673270d3a598428b2fcf1f9edd0be6ec SHA-1: a72723c9f4320aebeb0f4a73c4261f3e5e91b642 SHA-256: c497a9a64145195216a96d5db8305be7a58ddad51833b1753384876c40dbe641
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are structured as a link farm, a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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 https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/cf3e601b3cabf1946e7ae4a3070b82b1/16276940980.pdf In PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/8ge14e6gh202q9j6llb40mvcim/jefinor.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/58848588700.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/pomalewesa.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/22658003741.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f753ffe5---92255941840.pdfIn PDF document text
    • https://unosms.us/userfiles/file/11300390003.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3830594b7---pavozuzulezogilupa.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ce70a176dbf48e974ef77b06b3ede5bf/pafamilonitezapiwa.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/49912799424.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/xegapifufo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/fb2f7abab53aabfc11721eb27069c2c6/60004802903.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c250397c80f---gosuronajelu.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/kepudapis.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/95613520974.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/sefujoxekejezoxib.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/31466375828.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/180ac35b4285021a2180060a75e434ed/43447551938.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/8067973134.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8b4d02af4---mekinusokuz.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/wetaxugajif.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/fhnqjr92d90uunpg9nlddlvcp7/mesinumamigux.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f73501bcc44.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=solucionario+electromagnetismo+schaum+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/31967de8fd496f337a448d5d09714d72/2654148384.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 20048 bytes
SHA-256: a8f29b5e6b188ca696031a631fd71fafab5e4f41d3e031189b0286f1be4663d8
font_01_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 11244 bytes
SHA-256: 9f79d824b085feff73341eae233b18c4c48beb5d2e013d0bd3465f431931e48a
font_02_sfnt_off00012900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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