Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1caba9254f15364…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 13:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e04fe4a6e59ad2900b1676e6c5d4e8cd SHA-1: 6460868fca43b781142058dcbebf6b0222a530f5 SHA-256: b1caba9254f153645ed88a9de5ab4439c8caf8748c442c95fe99cfc2984538cd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the overall structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=polar+bear+what+they+eat PDF link annotation
    • https://asiquim.com/ckfinder/userfiles/files/gakimixipigosadanibebupa.pdfIn PDF document text
    • https://preciseenergygroup.com/media/mojefegisibo.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/51371948173.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/20785954405.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/22986919609.pdfIn PDF document text
    • http://amandamaitland.com/images/file/gibul.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/fisesodisutubir.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca82949c82---44384455389.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076695acac90---90418237592.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0644630001625727004.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/50775367865.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c7c82b2d5c7b896558c60b6e9c3bc6a/gotagozosene.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/pelapavavudeb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930007f405b---37357745360.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/fo1lgq843e53hlrk54udqla0q4/vilurit.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6ikgf2ota362ffg83pr3n8up2m/wowegisirikofobirikajonov.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9899687508cec888df22f2321a810f86/26009550839.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0d77456338edc286a3e5da53fc61d4ad/linikozifaragos.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/3668924075.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e27c1afc---24938209587.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/midepogotiladeperam.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/76805381187.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/12633855130.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/36462654765.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_off0000e4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 17528 bytes
SHA-256: cc207c824bb41f1e35fbdfe0c95580a7c1897b9ae98e75974d321b91efc85a79
font_01_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1B 10180 bytes
SHA-256: f4d433911d3b37a37964fb6c7ada0b8291e6c28d73c51b5fbb4608c3e6fb2cba

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