Malicious PDF — malware analysis report

Static analysis result for SHA-256 425dbe5a2a625fb7…

MALICIOUS

PDF

92.3 KB Created: 2021-09-22 09:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6d8fc741c8798d1d8868df5bdc37844 SHA-1: d05ed6665b268bcd3dfc2c813023f42cd97e75da SHA-256: 425dbe5a2a625fb712e7f19f5ec24b65ea8bb8be7e2a31ad61a9cec35d34b622
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many of which appear to be hosted on compromised websites or disposable domains. The primary goal seems to be to redirect users to potentially malicious content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=new+dragon+ball+super+episodes+2020 PDF link annotation
    • https://promenade-perpignan.com/userfiles/file/13853791201.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/84371180323.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed697bda2---63135286822.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161393cf6100c7---17151431813.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/16888461682.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161488e639ad03---90447975034.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322a1b56d46---tireni.pdfIn PDF document text
    • https://domilot.com/uploader/files/fodijefilogenijasoretiwoz.pdfIn PDF document text
    • http://lagrupacio.cat/file/32350502817.pdfIn PDF document text
    • https://www.znackakvality.info/files/90222263104.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/ganopagesazapasupepode.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/66673173371.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/joxaxezo.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/wotezawavanopilawaro.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/vixexelamobunitowazakik.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/zobadibolu.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/zakuputipexosutipakupit.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/motimu.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/31117173296.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/31513942934.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/mapudimog.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/guwagitojutokuxikivi.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/70982252927.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_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 11012 bytes
SHA-256: 3d65720bd0ac107acb189cedcd13cd0fef751f5c470c37768c6b6c980c5c1385
font_02_sfnt_off000134fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FC 18152 bytes
SHA-256: bce8daba86dc58101d3962dcc1ea744570afffef38f992c3a3298222defd125a

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