Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6eb8a82801b3e09…

MALICIOUS

PDF

88.2 KB Created: 2021-07-31 03:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e027d7206e1cb4bc739c732defee71a2 SHA-1: 5ce4019071a76834b04f847fdbdd10f890e0bb5e SHA-256: d6eb8a82801b3e09adba6775a56ae600e3f4f9805d7687760cbdaccf334b399b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to distributing further malware or leading users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=best+place+to+get+tanning+bed+bulbs PDF link annotation
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160900030ed1cd---17101628356.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/niponitakunonako.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3c75e5f78---panafunef.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/5276991729.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afd8fd590fe---jilanuw.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/6n7hhsvb81h99495cnos82urul/23182451383.pdfIn PDF document text
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/55078741841.pdfIn PDF document text
    • https://visualarchive.bg/files/jojufiragekegupelu.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/dobulafivulapipukejuxetu.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/devugilizupigirugul.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/rajixutana.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/mapirisewikesofozogu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5f6qrumpdmrt38gn9n9n1kdrm0/wedopogaboraxuramatotula.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/7987788788.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/15303042684.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/610a4bc267c5fb9334a8fd05b073a08a/12486543040.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cd34dc343---59779469401.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/iimb103dmj45divf53jbc0qq20/verunasadetopadirob.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/45985962208.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944bebf4064---faxonav.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9219432e7d2d4668862012504a9798ce/19819491143.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca69ebb470---zabamev.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/0ac05385d2d994b08dbb2e9c72b555b1/218530574.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210731_CF247B105FEAF88D.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_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 10880 bytes
SHA-256: a221071f8a8aab506d749a2f09dd0fa47148c8c83a6b099cdcdf4d3a3acf1765
font_01_sfnt_off00010ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 16760 bytes
SHA-256: 467645a5d5cf2b9456d4d423bc3f8e3b55dc2e51bf8caa8a8690f8c52d45c957
font_02_sfnt_off00013a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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