Malicious PDF — malware analysis report

Static analysis result for SHA-256 e174dd4e182f8ce6…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 02:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c229723daf4d928db9df62986c0d5a45 SHA-1: adeb3c427776c0367a0c76e4aaa193f60155a8e0 SHA-256: e174dd4e182f8ce6821fe8b9dcba541d570e036f0aef431c757b1cf3176c9449
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document, potentially used as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/165v7m3etr2k38pldr13iu9ns5/vexewegixatevosipitin.pdf In PDF document text
    • https://dalilak1.com/userfiles/file/gafagosufaxejategonumuv.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/nerenofuzito.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365413305d3---1957197759.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/zamaxozedivibe.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/mupijut.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/98274565839.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/8688210371.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/75966708366.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/gojinotuzomewixewelira.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/nopiretadivotugi.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/40268544345.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210909232915.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614544edd5449---zinifapumuxuwusifar.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/miruven.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/xeletokanowijewokidozu.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/15434756128.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/10395994286.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/95083870384.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/xazifataxur.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/79192096189.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/kixigilixavugobitomiwam.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/numefemenetifusuvomawut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tutuapp+ios+download+freePDF 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_off0000b375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB375 16728 bytes
SHA-256: 9aa4d5d08af80c4ad27b758a4181a4d48c69ab041e9fa702dbe353d410205acc
font_01_sfnt_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 10640 bytes
SHA-256: bc2cecb1d69181d9a843d6b79d944a38b93e2279647b86cae6caa39d2e2a6dcd
font_02_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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