Malicious PDF — malware analysis report

Static analysis result for SHA-256 786a94d01b201215…

MALICIOUS

PDF

94.9 KB Created: 2021-09-04 11:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2287fec1e1c08d9437ec9592f0cf154a SHA-1: fd98c850ff57322df22945949577cb73f9ccf67b SHA-256: 786a94d01b2012159bd8f74082b0ba7f359f8c8b73ed11da975fe523db1358c4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple websites hosted on compromised CMS platforms, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the numerous external links are the primary indicators of compromise.

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.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd676f2040---66791763353.pdf In PDF document text
    • https://netshopnepal.com/userfiles/file/winuzoriwijiwijajeru.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/90699547557.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/39802184297.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/59901665873.pdfIn PDF document text
    • http://boldogelet.hu/media/18428211838.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607f05040cb75---gesegorepuxiwevugotiniwav.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/904e787e62b648bb3e2ee3d696fb2341/gesitafemi.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/26522000053.pdfIn PDF document text
    • http://rinsacars.com/files/others/82910100237.pdfIn PDF document text
    • https://herfection.tw/upload/ckfinder_temp/files/20210630112315.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2189daa2f3---20471127612.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/dekoxapenojodi.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bb61c7aab3b4a28c90b7ffea684a9b7b/gixugoxaladegojozuw.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/kuritum.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/5poa0ijvs4d5oj45atdk2216je/40106280710.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/21803126001.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/buxugedokiliwipebuxoz.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210802205406.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/35017191548.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/jizelodur.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/sunobadaxa.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/fataxotufas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=starting+a+small+scale+business+pdfPDF 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_off00010de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE3 11156 bytes
SHA-256: 0eb630b9f45f9e2439ed316a52b3fe57613a92cefbb5364cdcbc8989889ed8a7
font_01_sfnt_off0001277c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 17696 bytes
SHA-256: 468dd7a1683168295f759493880c0ba3b41c1a16303ee6c5ad5b4ae916bb7ab3
font_02_sfnt_off00015604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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