Malicious PDF — malware analysis report

Static analysis result for SHA-256 f609dedd5cae8bb8…

MALICIOUS

PDF

75.4 KB Created: 2021-07-17 16:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1241237d1dd7b6eb136d17f6b28dca02 SHA-1: 9e84f011a433ba11f075209940e3e70e784510f5 SHA-256: f609dedd5cae8bb8ef4edb05cad6bd7d77f71f28c8f595582657b0bf6a704513
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://fqcycpa.com/jingkelun/userfiles/files/20210626162454.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609641ddb4aa3---fetekaxafidiju.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b297670e96aaf96132273c851548ea66/ditakorumugubuxalinisu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/8701dcf1ebd90cd116f7383fa3ff4e6d/lamazenes.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/38a9c3f0469d73cae56e6d3f17bb53e6/guzojexivalitugukodezopa.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/49682746337.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/goxepikoburiwabuv.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/83919449673.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/dedova.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/tepikufufedex.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210708182452.pdfIn PDF document text
    • https://peterdegendt.be/file/zajosuwobozalagotizutaro.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609034b23dbab---45263711519.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/pivez.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/24302919430.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/74381508042.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f6eec0490---17943523374.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/593b98ad2f9070787a5c39e4b9f9152e/35299275581.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/83921544727.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f497bd657---rirutovikam.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e79766e04466fc399188e209190e0f12/15603268141.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ipsa7f5v3pfe11v3flf8fn3d42/51324659611.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b092bb2fc8f---67052249655.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ad848588---96807370241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+meaning+of+secessionPDF 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_off0000c567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 16692 bytes
SHA-256: 78ca081b052243966e2874cc1cc339df107a08c8d550ecc19f89d4bace9c6da9
font_02_sfnt_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 10504 bytes
SHA-256: 59e9f94f1edf1148dcf847be8ea6df29295f4e235cf0433f2fa5b329b90fac51

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