Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8348b041a2d18a…

MALICIOUS

PDF

81.9 KB Created: 2021-08-28 19:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ba8a0295a688bd13f514764c5ddee85 SHA-1: 793d5c934f3355be599e946a6a39230fb4b87e72 SHA-256: ac8348b041a2d18a7776e33037bef1c534e33020b054cee3942941a5ff35d296
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable infrastructure or compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://thietbimaugiao.vn/Images_upload/files/titaxuvekabisejefafas.pdf In PDF document text
    • http://omni-links.com/images/blog//file/31423810082.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96d4a80bd90d06294a83c5a30d0d8bdf/vazowi.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/sudosanedixi.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///jonusow.pdfIn PDF document text
    • http://princeverma.in/uploads/files/21565344264.pdfIn PDF document text
    • https://belloverde.net/emailer/file/4078702109.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/wakim.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/luwizuwadanusumitugibe.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e323272c7---penosolibizirori.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/baxudoginomiwabe.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/dedubepaxof.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/gefagivonesojik.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5630152703b3a40609e45d2c1ff7bff6/53728806923.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/kenikasodeto.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/wuvafetigepopeweg.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/68374001130.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/6589712889.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/38106950260.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/timaposevolojexesom.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/018f0d5498010b83f25da6ae5379c894/tujuvafevusopizisukobiran.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/76567955645.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a96f7e4f204cb035049eec4ccc71a27c/54378100147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=3d+avatar+creator+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_off0000d149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD149 21456 bytes
SHA-256: 3f19dce855e2d9fb4b8425fef43643f87d5d9d34c5c2434f94ad267106850329
font_01_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 10288 bytes
SHA-256: c06f9fbe7ba11a240b74e2499dcf784f647c5d4eec09ec26aee9e1bc4cfd6026
font_02_sfnt_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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