Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e791c93746791a…

MALICIOUS

PDF

90.9 KB Created: 2021-10-08 00:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c1f04de6179d475b5b89237ab6f758bd SHA-1: ec66cbca05d45ece8b95e3212e035a727d73adc3 SHA-256: f1e791c93746791a0622b5d7d6eb741ea50dd137cd8da55278830bde91e4a919
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript stream further indicates malicious intent, likely to execute further malicious code or redirect the user. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • 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://chcial.ru/uplcv?utm_term=bootstrap+text+weight PDF link annotation
    • http://awards.nl/img/cms/file/40742252293.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7fa6a9df597f7c7cc4bdab120d56b93/22914524914.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/sigixoratun.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/3426454503.pdfIn PDF document text
    • https://gameclub.by/uploads/files/fezekisol.pdfIn PDF document text
    • http://henca.com/files/details/file/42699710502.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/xawumaxinezozumokipaveso.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/652485180.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/doxibe.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/libosebejobowevu.pdfIn PDF document text
    • http://cwesp.biz/upload/file/37439520832.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/467a0c1236171f9e9811e2dc818125e0/86332407678.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16158a22d7bc80---newaneroduxetexezaxidix.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/dotowetokizuw.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01794b8fa---wizowomem.pdfIn PDF document text
    • https://askflip.com/uploads/files/vumikulosubesagasanomiwom.pdfIn PDF document text
    • http://moderator.lt/components/com_mijoshop/opencart/image/data/files/70196837590.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/pipiriveg.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/27558838757.pdfIn PDF document text
    • https://daotao.cungthieunhidanang.vn/app/webroot/upload/files/60726390117.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/juwepetipuxejowozi.pdfIn PDF document text
    • http://okun.su/upload/file/savutolamilunuwowegaxiz.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/25745167227.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109071216001787.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_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 20260 bytes
SHA-256: 3a31768126c27cb89fa39263ee5d3d5c0e22a91950b0515cfd1602319b13b3db
font_01_sfnt_off00012d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14533 10620 bytes
SHA-256: 00ed276a9eba75bb3e0debcd75586f9d75b202fcef99f34903ae2ff0f04111d3

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