Malicious PDF — malware analysis report

Static analysis result for SHA-256 f899f32f575cb6c6…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 12:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5694d65386ea6b2ea9427c3f04d1f27 SHA-1: 69397f770fac88b6949bc564544f30982f8728e7 SHA-256: f899f32f575cb6c6269f8e336855f7f2314075b0f3e621caa197d18becfd4e9f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Installation

The file is a PDF that contains a high number of external links, many pointing to potentially compromised or disposable hosting. The 'SE_SECURITY_BYPASS' heuristic indicates the document instructs the user to disable security software, a common tactic in phishing and malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://saltokisport.com/uploads/files/37318745743.pdf In PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/16847155754.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/tafos.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161318e710c860---8909064782.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613418a9a68eb---79827869518.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/80401303866.pdfIn PDF document text
    • http://didopack.com/files/90026110489.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f98b01536---zasarumog.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/52900902582.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/lubijifir.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130819d78dd2---91497589828.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/biwawazozatiminonifaxeg.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f327f8d033---43256720197.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/87958895574.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/xozasobomobatug.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/57025504257.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/73796218433.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210901213641.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/fejasajopukipofanirut.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/27159577754.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3e0597a3---fakerurotepud.pdfIn PDF document text
    • https://digireg.ru/upload/36255792496.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/jolovusuxerebe.pdfIn PDF document text
    • http://zae.me/datafiles/file/31347920283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=latest+frp+bypass+tool+2020PDF 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_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 10608 bytes
SHA-256: 525d0ee97e749d026a3d53152d90dbec4ff5d4114b5df4d603600876ffcd4db7
font_01_sfnt_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 17768 bytes
SHA-256: da55e0bdbf568ae38f19867526e70665e11712f823a4bd7ed487746458222e51

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