Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7c6e626708937b…

MALICIOUS

PDF

95.9 KB Created: 2021-07-01 22:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f9b3afbc0f8668bda2c0a013581d4dc1 SHA-1: 5ac65bdab3f8250e27e13e61110276282a883be1 SHA-256: 0b7c6e626708937b38efccedf936e2c35be79ac809f4e64fe8d1a32d5ffd4c30
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607248f30b772---65722165112.pdf In PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57ffa218b---65861622174.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/58290983424.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3836ku080ua1ovrv0rikgae406/60284830513.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/dorekonaz.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e2d830fc---4815304801.pdfIn PDF document text
    • https://temahr.hr/files/nepebuvis.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/b5cc22586b0d7754dea5bfb9c1d17f8b/famakajiwoworifovuv.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/84970270314.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/lbfjquralrpd8aphfcjmma8g92/24458684478.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b08e30836---sunedifofored.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/setegakugedirejafijuwosov.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/e2e81e6d757009604bc17fe9dc39ab40/tixodaxopazi.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/30021151229.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/pufalisugukamegolijifi.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f183bcd41f---vukejovaxoroweve.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/wevibolax.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00be4e3d5f---naxudunorofevaxominasonun.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac82119b8c9---fezijumekazoraruxopij.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/wegovabev.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e404b47e3---goluwonetazoluj.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052503434128.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/13860985930.pdfIn PDF document text
    • https://hirurgija.me//files/1651184739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gymnastics+booster+club+guidelinesPDF 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_off00011467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7E 11104 bytes
SHA-256: 26aede8aff0e0804d26da94f5cc9a8c053523fb2b9fbaf5598dcbf57cabdc1e1
font_02_sfnt_off00014636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14636 16976 bytes
SHA-256: d3caaecf48484a2e23d4afe0c6d311bdf22b304e85a37aac5a1a8bf500b83d9d

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