Malicious PDF — malware analysis report

Static analysis result for SHA-256 705a8a236ed065f4…

MALICIOUS

PDF

99.5 KB Created: 2021-08-29 13:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9284677223128bf46f56062a86008639 SHA-1: 57c336f8237a99f66e98b0e4492f6f75f8441ad7 SHA-256: 705a8a236ed065f4eb2c919e2ffa2c68ad6a3e7ffeeade6974ea1b485fad2ce9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document body is heavily obfuscated and unreadable, suggesting it's designed to hide its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://clap-bas.com/userfiles/file/15693123616.pdf In PDF document text
    • http://ancient-theater.gr/media/file/nusitulolisefigupijel.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adea7106535---talowedu.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/70799255572.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/vigerebimaruxonutokiza.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tixijoviki.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc0fd3e2e3---waten.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/66152154194.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/83510390873.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7b6c7508d---novodofokel.pdfIn PDF document text
    • http://prestopc.it/upload/file/bunoduropukuzirabulamedi.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/codru8bnu3csno0sghbcqq0c3s/41686596570.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3dac4385---diwegixelosisikobajowetit.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/041cb8a80a6adc380932131c9de6b9fa/timomulokudakow.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865efaa3d36---90411177821.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074d27e96739---vovifasazodotomaxigug.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/setezubaganufewa.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210816100640.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/mukupisete.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/7c795b93e59c0033b82d43f1a434e2cc/98808624822.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/23298770747.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf5a9b7a9---bejafelosaxelabajunojibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=wolff+parkinson+white+syndrome+icd+10PDF 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_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 18348 bytes
SHA-256: c485d9f4d77a13c3df2fb87cf5f0402263d4ab8e39e5613a6d6947c36291d1d4
font_01_sfnt_off00014dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBF 11344 bytes
SHA-256: cf3edc37d5ef4817951e9ad138bc73d592ab6f170c2f85d1533b975402630515
font_02_sfnt_off0001685d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1685D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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