Malicious PDF — malware analysis report

Static analysis result for SHA-256 31acce9184e33add…

MALICIOUS

PDF

89.2 KB Created: 2021-08-27 08:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a27134acb42ff491c561ad9c48a3187e SHA-1: 6b4d1cd369be40da50f6d9f5185099cc95801b0a SHA-256: 31acce9184e33add50dd49aa2c65e7bf6ebfdc00728c1f42db48eb541f80b975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/uplcv?utm_term=i+need+a+paragraph PDF link annotation
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/judebop.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/loxabezowuzuzukagesawapu.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/tagewasisivimo.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/44445389155.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hgsltkepvp1fb54rq4t3kh2cv8/nogigole.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853ebccc326---97341755275.pdfIn PDF document text
    • http://3sdent.com/upload/files/29647603450.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/jfj4qmvqbc77uv2sbj707cj7pj/10939210242.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/metini.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/10874809994.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4d2339e121bf71f94b785c65160716ec/xesaluwojulawowu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076298046477---davadevetu.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/63415063724.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/3764655d3d2780437f08ea0e35449c7c/rixamexozujeduwunube.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/newasukinimajepejed.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/solidinufuboremo.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/98012126127.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e18962053---rosuvudofonuxejar.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9cd169e1---10906126898.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/n3048kigh6gek78eno5ih3g817/narena.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/75258498923.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba59ce41e2---jokonuvuzusetogubuxiruliw.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/95094927957.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fad7beaeb---nakadetofotuzogo.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/24770836831.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_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001161f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 10096 bytes
SHA-256: 40fdbbdf8862f47b144b8c58ab58867e5d941d025997784463c897e002eda369
font_02_sfnt_off00012c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C38 16468 bytes
SHA-256: facff35182e98636a5da39f4a7a99cbf6dc0c3e497ab29812a4a143446c46ee4

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