Malicious PDF — malware analysis report

Static analysis result for SHA-256 d886e3685a66a3c5…

MALICIOUS

PDF

98.6 KB Created: 2021-08-09 01:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fa2244b7293b8945c9c84f2139b90b4a SHA-1: b96558c257ec2c03cb25c150006d084e59b8b9cf SHA-256: d886e3685a66a3c5dfdb012bc0e6aa569331470800d74aabbe0478873a0aba6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=period+1+review+packet+ap+world+history+answer+key PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b27346c60bc9520b788204684c13b4bd/guvonejedujabadipos.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf628bda056---59518526927.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/b54u42sa0mjg8702a7p8pul7tr/semisenolop.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/wuwuzuz.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/zisizalulijugesuromuz.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160847df18c9c5---92567694446.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/kabajomunapeguviku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef4931816---38791337645.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5bc9c70c3---39341101274.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082ddf425dd2---75952361929.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/xetobatodojudufuluforo.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/gisuwuvirejoxowu.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/kunujefadidedewiro.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/1504980241.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/28849645655.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/fiposevakarosoxebasereg.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/04ff1c405a5c2e5cf82b0c543ef07929/44701237224.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4267417691.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/7f15c02946359a048d532ca7411eacab/94257983874.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/juzegexupakesa.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a63948d70fefdb50d0435d0d2f84fc41/wupinifibogonurunu.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ffe8f961073fd7bf0072d6ef3e9102a2/fujanesopebobisodisum.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160857e8a3191f---duzumisirivafevizakek.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_off00011930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 18072 bytes
SHA-256: d6826ff1b9cd301067e4463a0c98a4ead946afa7709fd75b66a99f4095d69fb2
font_01_sfnt_off000148c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160DF 11020 bytes
SHA-256: f3c2d5c075efc3852516972c29146e8fd32e0507d08ef694506d14fa27242b97

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