Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63f2175ab9363ab…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 09:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de0855579270a7c88c8dff13deefc40f SHA-1: 44080f767732574064b48daf6d82b1115047c416 SHA-256: d63f2175ab9363ab49ccfbca8ca1ce97a88c7ab59f66c9ec2bb8df29d7708b41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ahkjt.com/upfile/file/47954600786.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2add47244634bd369e160a567f82a06d/40463038607.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/49342451156.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/tapuzab.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/zetejunafumitujijulon.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/dasinaxetoxule.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed7ad2148b---korojujiwu.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/50323569998.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/97768320675.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/sofiw.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/2102146327.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/71621532729.pdfIn PDF document text
    • https://samowar.ch/upload/file/tafefugevuzokave.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/rewuwisinitozopasuge.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/xolubobokanijudozifozo.pdfIn PDF document text
    • http://zimmerei-possert.at/98852829915.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/45627248405.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/55076773937.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/98d981e4e87b2ae7270e0bf2d61b6ba5/gagivetakifi.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/wezixagizaloxikinetuwugu.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/9994951804.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/xolebebodaf.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/80572802422.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/digasedutajilab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+fire+ash+game+download+for+androidPDF 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_off0000b694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB694 10884 bytes
SHA-256: 32a57465d3f3b16603a5acebd7552e8ed667ff0af5ec5bb70244f414887712d3
font_01_sfnt_off0000cf64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 17360 bytes
SHA-256: 9699327755d0e62cb1c1ec7b41cefddf36d2d99f2d793d80fe1b361f8381522a

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