Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2fa946e0457cd81…

MALICIOUS

PDF

103.3 KB Created: 2021-08-12 12:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e194366d2905609f8a8a4e1df1e9125 SHA-1: 9e3bd44c017bdc93028216d7b8260b7cc92e6b01 SHA-256: d2fa946e0457cd81fa3028ab9ab042a611dae05963fc836229c6a9b51352e59c
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of a visual download button lure further supports a phishing or malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://t-eamplus.de/web/editor/files/409534891.pdf In PDF document text
    • https://marljivo.hr/userfiles/file/lumorovufizepusazuwelad.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/85292d39a09e17b580c5b88cf3f2f2ea/36922749272.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1ab34193f4b984a9427380e88ec42daa/xutujavap.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/wedajodiketawanedowu.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/30457786994.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf207dd27---81209789715.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/84987032562.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/46274335766.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609de122f3149---38742357202.pdfIn PDF document text
    • https://okvino.it/file/14228867369.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/fobukosabamapowoxusig.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/83081501683.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1516e29a4---59488864569.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/82347388321.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050706053973499.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/mopomup.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210610143347.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/jabufafakogigerigaxobab.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/97183364184.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bk5l4m6cdq2oo4khini1iau7e/31465563467.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/tunima.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b088a921b---nunurikazewofegekibemete.pdfIn PDF document text
    • https://ikima.fr/uploads/file/10807459192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hotstar+mod+apk+free+ipl+old+versionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11667 17712 bytes
SHA-256: 62d00758f390c926aa8d22c57d4521fecf210181c41f66fdf33b4f3121b52840
font_01_sfnt_off000144f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F8 10808 bytes
SHA-256: fe1ebafb3f0bfdc8a3830ba6a76492a9c09270d842485c30a7c33ccb6dcdfd79
font_02_sfnt_off00015dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000175ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175EF 17112 bytes
SHA-256: 6fb6ac1cbadb24f79f54c9a52ee53b22fe5be79c27a0c132ba9acf83f3f7d7c2