Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76dcb5bd3a0a902…

MALICIOUS

PDF

97.0 KB Created: 2021-09-02 20:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3c05fba4aa5b2df6600518ce76b26b9 SHA-1: b9beb04a2d3a0387fe2b6b6fdae4d61a5b83cf0f SHA-256: a76dcb5bd3a0a9025d25ba139a3a696eca9162786e84037e4f5a208540dc4898
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and potentially disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The presence of numerous external URIs and the nature of the hosting indicate a likely attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/04f956eff1219f78fe79008856c5b400/59775808985.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/cd49bc76bce301452ba05ca838f813cc/gideredawewimutuxe.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075dafb71685---6421233816.pdf
    • http://eaas-journal.org/survey/userfiles/files/wanuwebevosugefomula.pdf
    • http://chinasoftcore.com/userfiles/file///75644359094.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098ceb392ab0---57800408154.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a985b4c9684---dedebifedojibukafime.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a118a077965---15843820451.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/89dc875ffc1ed5d69cfb16721c2eb440/1628490121.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/pufida.pdf
    • http://originalcheck.it/public/img_admin/file///jowakamurawipobusage.pdf
    • http://pizzeriadevita.it/userfiles/files/96300919672.pdf
    • http://sangjeom.com/userfiles/file///tadezemufetimugijumawebi.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ee49d09b4da00ee97e5484bc4090f6e/90046392520.pdf
    • http://lblussana.it/images/file/gitaneminibumowonuv.pdf
    • http://versobrokers.eu/userfiles/files/39042665549.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/68f741fac1552513bb306082da87972a/19752684335.pdf
    • https://giolog.biz/images/bulk_images/files/31902165061.pdf
    • http://wjcopy.com/upload/files/xulopefubaforiwimof.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1463494aafd43446fcb72eca5fc2ce64/xonotexa.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c774c42112---95703998734.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c386b6b57ef50042ceadf89aef09552e/10571454790.pdf
    • http://gustosandvic.com/ckfinder/userfiles/files/72632721762.pdf
    • http://novafish.it/userfiles/files/sevefevoxuje.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c72cf50a6ae---juwinax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=journal+e+learning+education+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112d4.bin
69fc76412d67a93c15f84269ae3e8362f1b75647aba44c544a2154e30d299631
pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 19840 bytes
font_01_sfnt_off00014603.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14603 16792 bytes
font_02_sfnt_off00015e1a.bin
6dcade0579ce024997d5fd4a21006ad92024ca83b802820ac68da8e743be7ef3
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1A 10716 bytes