Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d3f1d4efeaedf2…

MALICIOUS

PDF

83.6 KB Created: 2021-07-01 22:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28d1921a3fac7ebf24e2222b9da9f5d2 SHA-1: 9b77867baf6569932b2903e0eb2ae21e77e3eaa7 SHA-256: 35d3f1d4efeaedf2ce13d95e90a1208d506ff85d8d67cf17ac52104f4a2b381a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious or phishing content, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/hk2ab8plgnvdtsf7momvvspf30/gorizetevez.pdf
    • http://promador.pl/userfiles/file/rerewatamikoleje.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c06385509---3699924367.pdf
    • http://ekolojikweb.net/upld/userfiles/file/gaxopejepemipifowo.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607247d5db002---22324069728.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092f876aa973---31761777170.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zomikeda.pdf
    • https://airbays.com/userfiles/file/zowadi.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/fukusurarito.pdf
    • https://standardpromotion.com/images/upload/userfiles/files/foribezaz.pdf
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/begasifulipipezubafu.pdf
    • http://syuncyoku.jp/upload/file/86798695772.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608de31492cb2---9617949303.pdf
    • http://budoprojekt.eu/obrazy/file/pupidodife.pdf
    • http://almar-bus.pl/userfiles/file/nenasanufagujate.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/tevotuzudaw.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606d446ca6f33---godukutemurape.pdf
    • http://massageindex.nl/images/uploads/51880818176.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/da72f26869c5e6070558f70a6c192199/47677998238.pdf
    • http://zabradli-znerezu.cz/userfiles/file/menijijuguf.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c937392bd7---lesoj.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e643f6timqugal19u95qpcnmp5/fobelepitafezovuvabipa.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4040e3fd5e34aa9309f85456425761c7/84566226984.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=a+bit+disappointed
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e102.bin
62b7fa17f7a6a2b313945534cec13d6ad7192734915cd7a8ffceb234d152db21
pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 10360 bytes
font_01_sfnt_off0000f856.bin
647d4ceba448ffb4d1e44512191a246b5e225f04ffcfb7ad5e5618fd05003ee4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 18808 bytes
font_02_sfnt_off00012977.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 16792 bytes