Malicious PDF — malware analysis report

Static analysis result for SHA-256 2124065b15dca290…

MALICIOUS

PDF

88.7 KB Created: 2021-07-24 15:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e3aa88dc3f1e82685ad1950aa9673ab SHA-1: bf18cf901596e25164376c36aa896d7bc8a66849 SHA-256: 2124065b15dca29048d17a5c0cb7f3a251a5436a604a3cc5ee82521e65e6a832
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple unknown URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae82104d599---watiwosoveximosaner.pdf In PDF document text
    • http://automozg.by/upload/editor/files/73945965814.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/39130146938.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/fetadasax.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607485049b4df---80775715691.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/sujmhhero7dr13iad8dk6fd3vq/juniniteduxe.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4d85798fb---soturaxa.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1d66ec3931c70072c7247958f5662c82/23370089038.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/21884608633.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-6/20210506160950312219.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/40750982913.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/13684334009.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/11944789671.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/de7d015d7220bda2d6e8179946f7c135/jidugesemesavodi.pdfIn PDF document text
    • http://boxethai38.com/upload/file/369730274.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/92253114139.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/naferugasoguwidojenik.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f0a70d1884db12ee770d445a9e15b05a/dawuwaxavexefad.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2a37760af8dbce8a2e8dea9378b2eb99/66511170904.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160723e2990289---sekexivuxofabegojisi.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4d6931e43---8282459545.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/q1otrrcrv56ilqro4958kpleml/36091537941.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/61504916531.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/sepodakunave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=grade+10+math+textbook+pdf+free+downloadPDF 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_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 16636 bytes
SHA-256: 3093e20590a2887f36b4089167c22b99cf5c52878801fd2afef43eac3ecdb12f
font_01_sfnt_off00012143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001395a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395A 11136 bytes
SHA-256: 07deb667375c4175f253b833b7dcfa412dbbfc486919e6feaba29bdc5ee8b8fa

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