Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c15d4efcafeac0…

MALICIOUS

PDF

86.1 KB Created: 2021-07-16 05:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 97cac2ac75c4a0a2150bdeb5f79e821f SHA-1: 1350bdea0e70c361f1c66ef26a66bec7ba00f67b SHA-256: 69c15d4efcafeac0932a862a2dc0cd7249b1ee25db1573699fbdf99b4bfc8244
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the presence of external URIs and links pointing to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bd0aa5c29---xegudukanilumu.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd95602d27---kirudotosexebuxe.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/06327b4de2287a88de20a30c6be8fbe8/jiletedexilopapolunepi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16072fdd43365a---lolesas.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb69153a383---novolir.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/47c4lq7pqm576i4j5lkrhrtlu0/23247268719.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8026f2d5ef---8792671733.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/d8ph2sn7ls2rrhprub0526aa0e/38254206241.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/83448542715.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1a6177d618438ddb94e8c392726b7f20/4865529556.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/toxogumaluputuriwowot.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/084463ea74469210d49f94f8d95433bd/63442925622.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/nobitujewan.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4528845760---gofoxetavisi.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/levone.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/98548956322.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/524kat6mi3m5k1lir6kkcmbg42/55053457081.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9635243aae---98007531774.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/92937073492.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/6208986788.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0f037d463---barojomu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16096adc289dbf---sagojotapima.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210528081801.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/11223604484.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/kovasusubizonepawikibipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pdf+file+shows+junk+charactersPDF 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_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 17624 bytes
SHA-256: eef34f52179f7f78d306c78a95356f494b2a426c3618b4c5bd69d19f92c3dcfc
font_01_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BE 10984 bytes
SHA-256: 4edb3f0e9e2902a41f7ebe66b7bac7c34bba62f390f0441904e2803734bdac06