Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7f3c1716cfde4b…

MALICIOUS

PDF

88.9 KB Created: 2021-08-23 13:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b5ef448ca5dafff3deb88ebab8cabac9 SHA-1: 3e367e01aa15b2e03b6a4d8fd204b96af3a80e16 SHA-256: 7f7f3c1716cfde4b0304278006dddfd6f850cca3606e3676dbc7c938e8771e60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous external URIs and links to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of embedded URLs and the overall structure indicate an attempt to redirect the user to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=slaughterhouse+five+quotes+about+war PDF link annotation
    • http://apexnepaltravel.com/userfiles/file/6419771762.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/91895444763.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b474b5f9cb697ccd890adf3a09340599/13999720912.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/lokimuwufofu.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/kegamap.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8bd149d337227bcf547318c1c6d72803/50890180908.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210724_C08B71827E19E1B9.pdfIn PDF document text
    • https://actorconseil.com/files/file/zefuvekowobadavabozipi.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/fosatisagexeka.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/sigapotasalexere.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/papofixelegugoxo.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/wefonufepuginujunasumene.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/28391189618.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sidikumudixe.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/agg7e2esvjom2t2sgg463c09ak/32482490242.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9f5e72c2c---fupakavekidilujifigoj.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/361e8165971b3a5dc90c6dc0eb13d60c/tarosemupemulaxemedo.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/nagb0gpdrdfs1j6sriavu04iuh/91969479089.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/vaminaxizutadezujim.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/95102854289.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50df58b8b---pepuwowafevasim.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/mepuvexow.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/qp0os6c5csc4voc3k6hlno3741/48590726975.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/dumuzagevumapakuluwepozu.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_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 17036 bytes
SHA-256: aba8fc60239dbb39c1070f34a1473d96e395adacdec2d2dd43e872197c0ba9e8
font_01_sfnt_off00012560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12560 11000 bytes
SHA-256: 39dce307c105e82a9469ae0d4dea6f1fa49d1e07225921bde3f68311770936b3
font_02_sfnt_off00013ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1