Malicious PDF — malware analysis report

Static analysis result for SHA-256 06e058685e528f9c…

MALICIOUS

PDF

73.5 KB Created: 2021-11-13 06:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ae2ef02a461af7662c6ea219aa308f12 SHA-1: 1cb6317dd424bc16e497b4e6a40f01bfd2dece75 SHA-256: 06e058685e528f9c04cb2dffd51057832167ede807f1380f273737288cbe1384
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. This suggests the document is designed to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://triptoboloyfoundation.org/editorsfiles/files/pupijafetezibitux.pdf In PDF document text
    • http://myjobcareer.net/userfiles/file/2021110110492673499.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/16246705531.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/21867671939.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617f5c406179d---92896338346.pdfIn PDF document text
    • https://istanajp2.com/contents/files/35632999205.pdfIn PDF document text
    • http://aweibel.com/Photo/file/linamagifokegevo.pdfIn PDF document text
    • http://selidbe-beograd.info/files/71027475468.pdfIn PDF document text
    • https://clove7.com/userfiles/file/zoxarosipimafaten.pdfIn PDF document text
    • https://gemwares.artchy.com/userfiles/file/gixorero.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/89505618620.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/juriru.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/75259518199.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161897be4caef1---45623436462.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/50241147204.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1618ca39102faf---mugiseva.pdfIn PDF document text
    • http://centromp.it/userfiles/files/sefojeto.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/38861308137.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/weranudininoparunopod.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/fazifubixoxepodivu.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/56869210730.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/xowutezixomobudejab.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161406fb60dfe8---68567799680.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/Z3ufxtS7Wvw/uplcv?utm_term=how+to+cite+the+declaration+of+independencePDF link annotation
    • 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_off0000b7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B1 10624 bytes
SHA-256: 658011bcdab1609f6aad3b897e9973771cf0044c8e15b9dcf4aaa4f7df7f0dec
font_01_sfnt_off0000cfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 18932 bytes
SHA-256: 40f04b37758315e6b877aa1f052ca454931098859c2f14d191f579d74d86bcd0