Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4598de8cc62b630…

MALICIOUS

PDF

94.5 KB Created: 2021-08-01 19:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8085b9c8ab034c8363e767a4da71853 SHA-1: b822417d2ce6c83073e0ca2b62571233f0046bad SHA-256: b4598de8cc62b63031d42ae562f7e98b8e8af9c02b6d471e611710a55ea45b59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised websites, likely intended to redirect users to phishing or malware distribution sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest a coordinated effort to leverage SEO for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://inwebjor.ru/uplcv?utm_term=bread+baking+for+beginners+pdf PDF link annotation
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073ec2b01bdd---24217836141.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9a10a736b---tisevipuperenapiguxulomen.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae82284dd5c---81496468761.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/87757812131.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/52177179493.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/36921343146.pdfIn PDF document text
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/c631b1affbe074fee3e51f1066f3b1f2/kodigosuwaris.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/nusedabumaf.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/dt26u4l2rdbv5gnl15ibjm8785/78047649788.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/50286434304.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f6a0ed19cd125822e822f534b3e280f6/66298261573.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecec3db24d---77288188213.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609278664ce45---jililav.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/latuxizidujigusolepeguk.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/50721ac585e83febc1fbe0679b194d86/6325591090.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b6b455937---netofebipuwosaxovadorik.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/82603247647.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/sonodedomurebul.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c704250a9f---37581279811.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/gewikobakajigifeneludupef.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/30ia1pdgaamje7u78tbj4b1q90/37617623953.pdfIn PDF document text
    • http://portableandcool.com/files/files/11960052695.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16075b159a95df---7926729352.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/79224140370.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 10816 bytes
SHA-256: 2f1180aed3acd954f5ba67e7403c5a81bb05597fe1b995063d06a157f5374c23
font_02_sfnt_off000127df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DF 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_03_sfnt_off00013e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E03 17584 bytes
SHA-256: 6205ea86c73fc674873936795dcb890e3fbcadc07535850cb651ec148e93f0c4

Open this report in the interactive analyzer, or submit your own file for analysis.