Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c8b59a8c90659e…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 03:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 03175cf4775f191d78a7ff6f637c3122 SHA-1: df4a511478c2e962aba6a212570564968ca492f1 SHA-256: 38c8b59a8c90659e23ed40f2d0becb01a0652af574cca3c353a77729d6aafb49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://irlanc.ru/uplcv?utm_term=mitose+et+meiose+pdf PDF link annotation
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/bbe0ed7fdaa13f60d279b01d40b0b5ba/65746810057.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fad60f8e93cb55142413aa89c34babab/30685269190.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/15263879878.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/wimixuwobobedo.pdfIn PDF document text
    • http://cpviettin.com/upload/files/3168108739.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/67240189479.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070389e32524---simevobojujufutowigu.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/sositisikotivepajumuw.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f972e126eb0c1970ea1db7e89bbcaef7/17445012066.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4830496f4---35313544020.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/dukiletalisofinepemataze.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202107200136126229.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/90661932876.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/zabarokowadan.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/66502158141.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/58677344244.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6avrap8ll15j131rtalfkl1780/mezelusosaniwasejumul.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0637abbf4---45951908358.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ade786807b5---xipenomudakoze.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d091102ab73d0aa9a11880422e319d56/nixuxapinojuzedewusirepa.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/filabupo.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/wozujumegegevuk.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b916aae14dec4741bc5602c94fea1fcc/kisegapavetuzoxuv.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_off0000c0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A2 17588 bytes
SHA-256: ab248ac046a857ad398504fac0bc2478a31873854fc542e0726e4d648ecf69bc
font_01_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 10240 bytes
SHA-256: bfc4e9208078e7fdb7f16e10c8655a714f41e8545ed846e83e17038eda9ad0b5
font_02_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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