Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a27ee85bfc8182…

MALICIOUS

PDF

86.1 KB Created: 2021-10-04 23:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 116128a973e67cef983fb3f0199d421c SHA-1: 3c09d8bbb5be28aec622d707570323bdf4b20cd2 SHA-256: 82a27ee85bfc8182c313203914a4ccaa0df6de7f7886943723df00c741d38d84
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. The ML classifier's high score further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://wastran.ru/uplcv?utm_term=project+topics+on+biology+education+pdf PDF link annotation
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161356adc26c31---tisinajowasonasoxulob.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/63785113113.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/getotewateparugotunapam.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/58602597904.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/gobirupanale.pdfIn PDF document text
    • https://udruga-invalida.hr/files/59084771188.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/dezesuvef.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/66967532016.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/xejok.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/zededula.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/25983946806.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c8c498d150ccb22671082a73f15ce44f/jalepinuferu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161501c409ed3d---83566517226.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/65427973755.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/43276557597.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/rigezavegufab.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5bb96bd9c---58907491706.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/64657311016.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/13026823922.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/kujipunenamuputotupute.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/34975467829.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/3294182709.pdfIn PDF document text
    • https://springfordfarm.com/sites/default/files/uploads/file/pulifijoparafuxitobubup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 11280 bytes
SHA-256: 344754b07f56ef2cc8140be98126cc28fa798ce088e7d65f10b527770636fad3
font_02_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 21076 bytes
SHA-256: 58e3c9056380cd95a77ee29e7348fadd70a2f61d224e98663f7ef6594ed0095d

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