Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9ec67756653648…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 04:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6267cddff94a9d69d438803ced2dc58 SHA-1: b858dce02c3705671dea9368c511bc476c506f4c SHA-256: 6d9ec67756653648ce87b85a9a642c775f26f36c2ad1badb664e9c9d7bc097bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these link farms suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mmszke.hu/files/file/kubotedarebijati.pdf In PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/37542865650.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/remaluboxozulukotagob.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/15470650753.pdfIn PDF document text
    • http://mega.kz/media/upload/files/lagamikobejobatiko.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/98298457329.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f08a2c2dc4cabaa39bb13e11e2960139/66632385328.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/28319459940.pdfIn PDF document text
    • http://dogable.de/userfiles/file/16576962028.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fdd289140---46473495787.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607820f5a3619---wutukipezimozomuviwixula.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607757749ec40---16608023912.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/72900566035.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/nololuzuderitefemi.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/85393304466.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/g27ma3bljrr0ir23lsukeo01ir/47348111627.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/5107762246.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/10/namapababixujipexuvol.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/wefobesutamidararaze.pdfIn PDF document text
    • https://vestol.bg/files/file/potokatad.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5aad5392---49345727597.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/kozovevunapikoguvi.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/6da965ca26da660fdb4abdae201e44fe/57803443020.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611822ee79bda---bazabalapababawit.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a7b9a1cb---potowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=black+and+decker+thermal+coffee+maker+manualPDF 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_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 17996 bytes
SHA-256: 18d15088a37a0dbe7677000c8988ac5be7f1cc2bb58a05e6e1d04b1a12da2c04
font_01_sfnt_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12989 10724 bytes
SHA-256: c6c6bac804535d90c9ae013e6c1b318408ffde2381bb37c9858278f7569ffbbd

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