Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af9ea1f640d1cfa…

MALICIOUS

PDF

89.9 KB Created: 2021-08-05 07:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1940a57cf5898cef3509ec6a6ca3787 SHA-1: f17ad7fa0fbd6e6a0079ecf345b9575f2d48b7c7 SHA-256: 3af9ea1f640d1cfae202cfe2876c3479b1d3183b0470763257d881166cef4256
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a visual download button further supports a lure-based attack pattern. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings indicate an attempt to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://drafthe.ru/uplcv?utm_term=download+game+android+naruto+ultimate+ninja+storm+4+apk%2Bobb PDF link annotation
    • http://ifaistos.reality.gr/~triantaf/images/file/dufinevax.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9f1acc0d7---32978195374.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/jomerijosefezajusagori.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/wikanawodulof.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/zugudunegugetolagovos.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97fc688838---vodepezu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b49f515bf---92156901310.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4b53f67d---dobuwiwoxomerovaxomima.pdfIn PDF document text
    • https://aedwea.com/upload/foto/nufuxiwuwitodiva.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ab50d6987c068fc35455fe9c467a4db0/8501061851.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609461ea6ca3b---56635203994.pdfIn PDF document text
    • http://kbchina.de/upload/rubuku.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607028225fcf0---31241718168.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/89359419484.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/33704317767.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wutusilebokimexuxaw.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/lokexuladijizikosi.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c2ec6950cbe4ce797ff09d76b2a64d31/93452928028.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/77119304691.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/labivakamozan.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e6726172---bajexojotogaximo.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/93863310343.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/lojubaziretamafotoranedul.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fa2f4b8d929d99313b3009fa07fb49cc/77177578700.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befb191d5ed---67205532119.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094993000c6a---84813013318.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/pijapanubometupef.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_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 17452 bytes
SHA-256: 5c998f429ea67b910cbf0497bcad380d9ed81113e8d32e705a7335b704527dfd
font_01_sfnt_off000126a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A2 11364 bytes
SHA-256: d313c20731f3b9f656edfb41aa4264207f7eda03fc1fc3e54f2cfdca62ccfc45
font_02_sfnt_off000140f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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