Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0479ca509c55c4…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 05:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f5e516f0a7997e6f07eb61cb42405f0 SHA-1: 8f4c6dfb49697adf86ae29e14a96e54fce8521d2 SHA-256: fa0479ca509c55c45155e21b3fc70b8b4fdade86c6387550c7ebf7a8c00b43d7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content or for SEO manipulation. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://uppersanduskyrotary.com/cms/files/File/73214223580.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462b6693cba---82080135678.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/laxanup.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/77443877520.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/sitapusaroposojajugunoxaw.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/mirakotemepofabibelu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5d6cd63722ae85abbd28bc7a584d64a0/42705189170.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b33c0d13a---70592242525.pdfIn PDF document text
    • http://trieuduong.com/images/Download/sezafatob.pdfIn PDF document text
    • http://redactron.com/userfiles/file/rogemepanorazezufode.pdfIn PDF document text
    • http://innotack.com/userfiles/files/kolifojesixuninepazi.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/51233455793.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/61671722405.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/giregamixopunazokatitimok.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/37259170339.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/95747742938.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210907_8B8E07D5D8008B71.pdfIn PDF document text
    • https://seikai.jp/free_images/files/46329402654.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16143ea309fcc8---renukugipuninot.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/591419ff35cbf9eca7db4f98df0f3f2c/72581842480.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/59091805181.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/65555894657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gallian+abstract+algebra+9th+edition+pdfPDF 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_off0000ce86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE86 17280 bytes
SHA-256: 7e83531510312e20693a53e8b644b11d9bb655ee12ff8ba623f06b89402cca7e
font_01_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 11248 bytes
SHA-256: ee6a87ac6b61d4a8021e3c311698659d1a480e7c5a17a9ff4c0c0e0718cbd3d5
font_02_sfnt_off0001155a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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