Malicious PDF — malware analysis report

Static analysis result for SHA-256 352ad07f02e91fe7…

MALICIOUS

PDF

74.9 KB Created: 2021-09-09 14:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a5ce460d6e0671ed0ed9dbaba0f461f SHA-1: f0ec34cbb4da37a9cabc5cdab2bb7c3b263dffde SHA-256: 352ad07f02e91fe70a82ae3de6a07622abfd35ddb9d841f0d89fb554bc5852b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to PDF files hosted on disposable or potentially compromised domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious payloads. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=share+file+via+wifi+android+to+pc PDF link annotation
    • http://langmypham.com/luutru/files/82368172695.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/likajejidudejebadinule.pdfIn PDF document text
    • http://khocabien.com/uploads/files/dogorapelegomatarugurovag.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/momivazunezajowide.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/46629444988.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/falur.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/98416540937.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/gufamufebidego.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/83974512605.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/j573hhild3vb3uc9bftrk8emq2/wifelidatuwevogogon.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210909062103.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/kexonigu.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/zixesew.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d4254828f---80623289886.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/wodukewoku.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/tutag.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/liteju.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/20669840902.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/81996043014.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/60396278363.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/86772573053.pdfIn PDF document text
    • http://schokofontaenen.de/idata/naxedibapi.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202196_123935_646.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161356e3c6f6bd---gememerufes.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_off0000bebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBE 10776 bytes
SHA-256: 72054dd8046251968bc371c32114040e6830dc8dfdbe9781879447a0fc3cbddb
font_01_sfnt_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 18004 bytes
SHA-256: dad45fcaadb3f5eaab5b86e19232239178e67b0345ae798c902cb7e26572bd32
font_02_sfnt_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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