Malicious PDF — malware analysis report

Static analysis result for SHA-256 917971de10a02fb2…

MALICIOUS

PDF

108.2 KB Created: 2021-08-09 15:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80f2542f6da76307f1c792c1a1bc08bd SHA-1: bab5c0d21d5ad1407deea8f4024b3f71010706f1 SHA-256: 917971de10a02fb2e092df1825b1db34d51aa656627e9425b89380fe3eed433f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://allytemp.ru/uplcv?utm_term=python+the+complete+reference+book+free+download PDF link annotation
    • http://sallytour.com/FileData/ckfinder/files/20210701_1F6D4CD84C136B63.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/784850f68ff520af2b333f053fc5b05a/saledokogezibenezatalimap.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16103fba2c6d63---xeziduvepakusujav.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88cf8252ec---tivisarivorijaxow.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2f41e8881dafc50fe124274bebfb7bd/8384641982.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160770c724d542---goxaratuwefibuviv.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/273b93a1041e30e338a4f018f83f923f/bilowuvixarexekagimire.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/navagoxosujakuzal.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/75616544273.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8df6db058b88de4189dc5ba7b6a250ff/21891395095.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096fc628f531---3431357492.pdfIn PDF document text
    • http://fittbike.hu/files/file/98135158779.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/63923472460.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a33509a5386---86391381796.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/vobinesasuloziwegusafe.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca0e1c8a32---52022083602.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/70379020105.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/33c5fdd5c6f2c9aeb05f63f69207f98a/femivufutomabipamez.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/26ec13d341a6ab689159fa21f18b08fc/maloxozidejirun.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/67119075315.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/29268136598.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/bikezazeturipeg.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BC 11060 bytes
SHA-256: 5cd8ed749ad974db005e91a978f2f7415e63cb1bef73b8c20da07eb6697e889f
font_01_sfnt_off00015a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A21 18328 bytes
SHA-256: 79b60a1b6cbcc034f106452d2aac49a68f17a05d6836525aad08582292a6e2b6
font_02_sfnt_off00018ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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