Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdec41c9fb75578…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 17:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7986fbb8b4fbae322af96dc1e3481edd SHA-1: d516b12a74ae7744577c5754b0e22e3914b58463 SHA-256: 8bdec41c9fb755781654fcb9b74cdc31ecd5e1844b738a13c31591e071d3a2ee
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=naruto+shippuden+ultimate+ninja+storm+4+psp+iso+download+english PDF link annotation
    • https://hobbes-group.com/upload/files/volototezakasi.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/ropepavewasifonudiv.pdfIn PDF document text
    • http://rvhifi.cz/files/file/70667790129.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9fdd460b---79450517794.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/reromudo.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613344402d4be---xukapivetizijes.pdfIn PDF document text
    • https://pecsikult.hu/files/file/34238232584.pdfIn PDF document text
    • http://esteel.my/userfiles/file/78871750685.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/mefajanirexoxuda.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/84679333334.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/megovasorijigo.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/gevemofu.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/binenovinupoxesi.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/gifuxetobokazakex.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/4463649540.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161349d775d151---vigetogutoresina.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/60361492909.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/bixofupijurelaxapewudaraj.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/44ebb2aa5a388861db9945cdd958dfcc/padifu.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/nojosudimunup.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161330bd0062fe---33989452029.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219313884352.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/68126730998.pdfIn PDF document text
    • https://dintek.eu/uploads/file/42203558301.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139a3565ee3e---65169627936.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/8363153379.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_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 11208 bytes
SHA-256: d035fa86b608dab4e96ce70c14c8d50622d3cacaaa303a8d4518f901fa6610ff
font_02_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 17852 bytes
SHA-256: b0e478641529e372b249ca5c8f2581113970d46e800eab465f26f033cef16658

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