Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f92616fcef1977…

MALICIOUS

PDF

99.8 KB Created: 2021-09-07 22:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c40294c92ee5e67c44791e4557ea7f6b SHA-1: 64e163cbd0858a7bb54231562aff2d3ec0472d85 SHA-256: 19f92616fcef197795a34074c00dff8cad5db6c7b8ef51ae35212041d3068af3
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 0.9961

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.
  • 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 http://annandale1963.com/clients/69704/File/33586292125.pdf In PDF document text
    • http://gldbirdgel.com/user_img/files/difefebozimuku.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa35cfc9712---waxupuxurotubefujoguj.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080d88048204---14907254752.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/kipidolemafuduz.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/rizor.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/vexotoxepadugeze.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/73506643758.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/90113409122.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5f7e16270---pawajewajukomudugesud.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609107a7a7bbc---18291085341.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1f73c7997---migapowopuju.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/55773961340.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608473b51004c---likebovanetulododinuwuva.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b06bb3fb4a---67298817398.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/86123992888.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/zepino.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ba568081f---babediresumuminul.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b7529f9cd806220eef710e9c45afe639/25417234828.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/15/files/43687326204.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/6525555606.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/60727482931.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/01fcf4be95ec918fc17862312522fe72/41369605863.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/zosodopobib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mazda+mx+5+2007+owners+manual+pdfPDF 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_off00011cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 11236 bytes
SHA-256: 7a6365fc0274aeb3c523d857203cd3860cae2a89e1898b9a35fb3fb1b64fafca
font_02_sfnt_off00014f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6A 19452 bytes
SHA-256: ba95d6ea0b4804acd664ede4ab256dfb5fa8f4fc6fc1ec9f05adae55487fbb34