Malicious PDF — malware analysis report

Static analysis result for SHA-256 32d329489019d030…

MALICIOUS

PDF

71.4 KB Created: 2021-09-19 02:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c7dcb6cb5c89e66a44130bc66f8c53c SHA-1: 72a0a60a08afb781e85e47aaf177b05ca38624cc SHA-256: 32d329489019d03077b4b5e4aebd469dbfd33bdf03b6951c8608a5632c498276
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=vice+city+ios PDF link annotation
    • https://sharedsynergy.com/userfiles/file/daduvixavususisadikip.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/dc96d3e11504e9dcb253e15b5379652f/narotenemobewegi.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/26494427075.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/burinesoretizeserexis.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/4bb3edaf4c8766d2f142ffce15c27547/33619152160.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/63708174212.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/11360481606.pdfIn PDF document text
    • http://naviway.su/upload/files/wezipota.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/20026948892.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/99611407149.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/93924846063.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/80181728196.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/dugafuzawu.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/demidom.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/62472292664.pdfIn PDF document text
    • http://davcpundri.com/css/file/pinefijebum.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/6578399429cfbdc9ffcf4bbd0fa885ca/5529192737.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210913191918.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/67752858934.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/61781312540.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/66604844031.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/tilad.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/veroxaforefin.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_off0000b978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 15876 bytes
SHA-256: cc8d2a05f388963c56228d7a28b6070a977a994b340936e19153e34b1c4a5f06
font_02_sfnt_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 9896 bytes
SHA-256: 9a474d571fd2a50ce7fb1fe5b9585499a3a38fb0cdc186c0aee34123c70613ff