Malicious PDF — malware analysis report

Static analysis result for SHA-256 79158d984a1432d2…

MALICIOUS

PDF

88.6 KB Created: 2021-08-08 06:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa41c1d9f282b5c289db68cb5b0ca921 SHA-1: f48f7a76290914e28528c36cbff30f127a801177 SHA-256: 79158d984a1432d2ff7a600c6d8ee755ab3ec4dfeff3ae6bad44baad8a0ecd71
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://elearning-chemistry.ro/userfiles/file/nuzuga.pdf In PDF document text
    • http://prime42.ru/userfiles/files/mavilidavejomunowug.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78b3e65be---nutidaliginewowokakujufom.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/84942900335.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/63483916353.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210702031548_aob6f5.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/69652be838b12e3f6af0a712401e9d8b/zixukufipebovetono.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/47521417830.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/novijafugenagodak.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/mibovitimonabelukafapap.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9m5c8mmjfbcvid6hrb2dofcn65/30997146069.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/fb4c20e093320fa1a91cecf4fa33b381/sarujuwed.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3c10486e---likuzivexekuxibofofi.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a37072ab68ec2042c7894ba2cd717bb1/kuzafe.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/56190461370.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/77371053479.pdfIn PDF document text
    • http://flomojapan.com/upload/files/xaxalapipexegig.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/d7mrs4k1qe2dvp92r57befc997/35301640216.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/ridasefonatonat.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609accee416f6---nosojobetagiteritenaxemo.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090efeedd99c---85746884804.pdfIn PDF document text
    • https://menu2uplus.com/images/file/vexepezorijarop.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/76c379be38c1065c0c73b33bab6f5f71/vevikamodifoborituza.pdfIn PDF document text
    • http://chinalabware.net/d/files/bukanuxato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=evicted+matthew+desmond+pdf+downloadPDF 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_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE5 10920 bytes
SHA-256: 13cf0191279a34068f93a05bf574062c882c062b8643e9eb6addf0f324aa04be
font_02_sfnt_off0001280e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280E 16876 bytes
SHA-256: b6985bdabee8650d3535106ee1edb0d541a0e1306ca5c8bd65ecf96706a4dbc0

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