Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaead5c956daf37e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-08 23:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66f8764e083ee198f5128f0a3f9b1696 SHA-1: 976c7670a80b6aeebd9a8b1652a4ae573427a74d SHA-256: eaead5c956daf37e6d45d46eee3fb53ad37fc990062344e240881202749d4d83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple unknown PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leaguengn.com/userfiles/file///lejibipesolinawabiwo.pdf In PDF document text
    • http://ceresasrl.it/userfiles/files/zabekaraxowagezegovutijem.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/24077817910.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/26109654131.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/dazifidedosepagapafuropek.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/11097094242.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/gapepuwemitawixusi.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/rodozutekobarali.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/pemereligodepetazukimagi.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/3328853150.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/74256227419.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0db2d398---zigiwulu.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/42293799964.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133982f49095---10275788290.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/27629903307.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hjajcmlob3gtj93bmpd6e3ckqh/xujilojazekaw.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/46636060548.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/10474903548.pdfIn PDF document text
    • http://fxlcd.com/upload/file/21618139841.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363d759efee---97021940858.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/14204048522.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/38041172400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=i+want+to+root+my+devicePDF 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_off0000b65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 16068 bytes
SHA-256: 79dd273151e21ea77d41ce6e2aa0568a22daadf074be180db750b46b6f1e3d2c
font_02_sfnt_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 10536 bytes
SHA-256: cc8a2b63d2b0da830d5c10cc603f9136122ccc060d73f5544b38cccdad41ec82

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