Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00f018564359d05…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 02:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e31be8069f8298242a18e8693ce8f8e8 SHA-1: cd1d9a4869d986c47b0579f5bf3fd98c0f2c6290 SHA-256: e00f018564359d058f0ee79d3c09c8de41dbe39b1476b22fa8531f25d5f12cbf
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs and the document structure suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e663f1fa0d---jexedamuvidibizilugovutav.pdf In PDF document text
    • http://lapenya.cat/imgjovesnaves/file/45397977258.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/domasumidajaxizinolen.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/wakelavirasi.pdfIn PDF document text
    • http://abroadster.com/files/makaxotizi.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/padifalaxerepexufosus.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/30151077999.pdfIn PDF document text
    • https://artbynela.com/uploads/file/pamunodimiwowikoge.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba63be73522---noruratot.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087ca68e7023---20536843924.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/73609170550.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/122drujc1gkc988jd5vtdc9g58/93149526721.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ap84f935mdcchq50vuc1qmf3p2/37418056677.pdfIn PDF document text
    • https://bataretak.com/img/files/file/mopipigefoxetepasedakasam.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/24650955494.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087ca757c5cb---gosenoli.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/81031138839.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/9126nmj9n4h51egsh3s6uv1jt9/kagijeworetobadadesoz.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/xanopatubodi.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/fopozezaseterubiralugiwab.pdfIn PDF document text
    • http://k1a.ru/images/files/file/47403585343.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/fosewi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8cc5b742---ruveroma.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f3f8ebf18---11489497549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=example+of+xylem+and+phloemPDF 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_off0000ce7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7F 10504 bytes
SHA-256: 97e8609713db5562d0476d134a1c1368e2cdf3782d508b9d344b03e434ab79e6
font_01_sfnt_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 16904 bytes
SHA-256: a487329f82511e6e2b0bc786bf9c47032136f3f74590898245e99f2d12b8a067