Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1c75895f5561a8…

MALICIOUS

PDF

68.9 KB Created: 2021-09-23 08:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d635c3b591c7ed9aabcea570c80aa5c6 SHA-1: 47d486a399322a9c81e3f4105836adec0c30762f SHA-256: 8c1c75895f5561a83dabf3415d62b4d9d17ec9195b860cd28b9f3713284cf15a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. The document body is heavily obfuscated and does not provide clear instructions, but the overall structure and URL destinations suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/81f071b4dccc437fd94df745ff97f5c9/sivojorebonasinexiwederak.pdf In PDF document text
    • https://kaparatt.com/images/File/gazafasasoxipulemula.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/winutexubutafamiliruwimef.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b755cf63e---toliwiz.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/giwerovososolovulepoza.pdfIn PDF document text
    • http://4darchitecture.org/img/all/gajidonolutapujokewugob.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/23072721749.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/15358287360.pdfIn PDF document text
    • http://czminghe.com/upload/files/zovorobasosapar.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/fefaselekojudejikisur.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210910042802.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/tomovobekepuwejomazapu.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/22488137391.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/nadaxopibamonuvesejed.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/binetudiwolaxaloz.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/wogopiwofizijafakexejizik.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/wulugofiwusamonaw.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ba7456fca022061570a8631c45646f90/dumovojonemiwomu.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/16372901370.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/70275461321.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bc23a4475c13b052b5c7e23d83a1c96f/sojijesowipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tx3+mini+price+in+bdPDF 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_off0000af24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73B 10460 bytes
SHA-256: db7fe2fbef5040f02ff1368219119c0cf9f2f2edd541ddfb59bf9cd109e5f837
font_02_sfnt_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 15496 bytes
SHA-256: ff448d3e18e6773cba58e8140ce5e26f5f9400ab184e499a50f5af8357ac745e

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