Malicious PDF — malware analysis report

Static analysis result for SHA-256 4069ade7091b63c6…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 07:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5e157246bb1ebd935a2e915fc850dd6 SHA-1: d0e216b07b794ad66c3fdaa30f695a13fddc8cf2 SHA-256: 4069ade7091b63c6cd3f2f2d7bbffc44d82781256def77fe662f9487540a562a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly suggest this document is part of a phishing or SEO manipulation scheme, likely intended to lead users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://naveenent.com/administrator/imagetemp/file/49356350149.pdf In PDF document text
    • https://bostaninsaat.com/image/files/2461947048.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f6b655b7---xejakojulejidub.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/39565840287.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8fc5011e1ffc8a078559ee30fe0d5521/97904988629.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021060606203973499.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/93443588187.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/dasobodukemubef.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e17e8e900---68040190145.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/k1g3jug94q4vj44pujndo4fkvj/bosami.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/40038415548.pdfIn PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/jisefamodezarabob.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/64240071638.pdfIn PDF document text
    • http://strandedtattoo.net/file/jalaxawazotilekozeronuf.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93046609394.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609070fda7dcc---12432197213.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/miwosixubufusov.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/kowasukelosedanex.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/acg7c2u9d8b3c2vb5c05e11tnn/botodedagi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c563c4348d---zekafosesikojaxovotunata.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/2944453216.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd958bcacd8---nixuxezegeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=translating+algebraic+expressions+worksheet+math+drillsPDF 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_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 16680 bytes
SHA-256: 6c75423c1541400ab6c42176fab4f648eceb3527e921c422b150f2854d2fc20d
font_01_sfnt_off000102e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 11344 bytes
SHA-256: 5d384b12aa59c0e52f5150940b57855d7ceb1c5e71fbb09e1afcd4e45e68e81e

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