Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a953aafa2e3d9b5…

MALICIOUS

PDF

90.9 KB Created: 2021-07-07 14:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f9e97fcdc61f6edc1680321951b656be SHA-1: b80b1762de467ed9670d13277f5ba3ad582c2cdb SHA-256: 0a953aafa2e3d9b5866be89998926943e9d0f10a30ba8e907ae9a0cb7fd33245
164 Risk Score

Malware Insights

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

The PDF contains a large number of external URLs, many hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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 https://crysiq.ru/uplcv?utm_term=convert+pdf+to+text+software PDF link annotation
    • http://temple.mo/userfiles/file/64949808215.pdfIn PDF document text
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/ts9ja3vqb9bl9v9r9v38fj1m3t/26375077752.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/87153785745.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/84248914277.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/8f45cb42eb8be03e6ca4ace78086f57e/2170537459.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/29080024528.pdfIn PDF document text
    • https://anfauglir.com/images/file/sakipurimojaf.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/zibenepawagomupin.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/fodafijetuxuj.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075804f0e2a2---85444025029.pdfIn PDF document text
    • http://becucci.it/userfiles/files/38327738934.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/38830717727.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e47a2103e8c---kenomibavusuzoros.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/moboduk.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780bd2a87cf---71443854316.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/tajogabe.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/kr5o8kiq3kqe0jj4mst6pj40r1/94683017628.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210517/file/48524978555.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c0f31fa3f75f8e18c8f08b56f9be6f63/38962048724.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/teduvebezij.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/891b64de3e181bc7bfc64a96db1d6c22/94614252974.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071275fd7d80---77822136853.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/fa46843fb59a7ffbffb8387ec518ebe0/diludigu.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_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 10640 bytes
SHA-256: e3cc630cd30b40010ab17559ec4e31f2e5f4a4ee0a8740c38e104535aa2f9a08
font_02_sfnt_off0001324b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324B 16944 bytes
SHA-256: b0d33f077cd39d3916bac87a5630a5e4a45a03209be1dac4dcc1474e99229340

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