Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca36b8d584451051…

MALICIOUS

PDF

118.1 KB Created: 2021-06-24 22:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 71de541b1bae6261b77e2e9c97d5891f SHA-1: fa3ea0214200d119e8947750829c7896968cd8f7 SHA-256: ca36b8d58445105162929414987aade4db870721da051836d1bda8b2d427269e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body contains urgency language, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://gustosandvic.com/ckfinder/userfiles/files/92170929609.pdf In PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/acf7b46f87c82530fba98bfba3653f6d/ledimotigiz.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d79a79a8c9---sidogapa.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/7349567798.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/329704382.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/fowemaxudowubogaxe.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57d1455ef8---6137170731.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210618075052451.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb131187b1---25512227382.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c8748e341---tigobabobibire.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160854912217f7---poretudasebuwu.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/68e136dd6e97a93d2763e243b39f1e3c/vafesoxoxavodoxudamunusir.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c7398eea1aab5cad42e2a19eabda578a/xipuwav.pdfIn PDF document text
    • http://robalton.es/Albums/images/file/%5C/mejapob.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5627b66e456c1f93b5bcc3091f6a271f/90630042676.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/94852750883.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/nejosovebazifoxexilojeme.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/babixesi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=according+to+all+laws+of+aviation+beesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18825 5256 bytes
SHA-256: 2b7234b9463edd7e19f2f86c7474384654ee85068b0d4ffeafce079dc8ae578b
font_01_sfnt_off00019a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A20 10328 bytes
SHA-256: 85878b2e3dbd1efcd729ab942003e3fdf8fa73ec1571ecb4323cff6cb35ed0b7
font_02_sfnt_off0001bd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD18 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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