Malicious PDF — malware analysis report

Static analysis result for SHA-256 3895f331170457ea…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 02:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 77468f199fa0770ab5ff25f79f4833b1 SHA-1: 07e243f0f186197f43b1423df252babb3adc035b SHA-256: 3895f331170457ea87c3e9c93f5d7b38dc552c90ce6e2c7c1a9e2aa7bade50ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to lure users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=mobogenie+original+apk PDF link annotation
    • https://ltes2.tw-goods.com/UserFiles/files/30473079034.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/dilepasupobemodebofipez.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e34ba7462---95527137715.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/puvifoforewaxuvibole.pdfIn PDF document text
    • https://dintek.eu/uploads/file/wowipijupavomeredase.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/nunaxoxadojazizeku.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210920070351_agyf94.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/0ae6d1775dc6b7336be858f4f3a58407/lawubikibuxa.pdfIn PDF document text
    • http://adriennemason.com/assets/files/berufunaxabusojan.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/limamire.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/79726415170.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910121915.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/13a3ed3e666af22f1f70cb9f7179f316/69073226511.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/jowuxedejononizoroxariw.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/kukobifezel.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090312274028.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/popag.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/12655381469.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140ce3e02356---97638582556.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/47407045026.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb055e869---mutuzitupux.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/89a33c2998687b7dfdcfa95fda0b004b/rufuwapav.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/lulawitaseliwemadejix.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_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 10388 bytes
SHA-256: 42d77b4837e7143233daed1faed4642083218e7f7a5087bfede80e2b3ac80c11
font_01_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 19736 bytes
SHA-256: 41ca9bfee569b5b5f98002472b09927a00fed016b8c9ce105548a443b094b653
font_02_sfnt_off0001244a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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