Malicious PDF — malware analysis report

Static analysis result for SHA-256 d279ff56bd544225…

MALICIOUS

PDF

80.9 KB Created: 2021-06-27 13:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 56476583158daf1b9f44117ff398ff98 SHA-1: f2eb6503c960dc41d63cd9d30e479698b22ac43b SHA-256: d279ff56bd544225998b0447ee232bf6e0ff51fea874e068f4d7f1ece414a647
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5fdd4ab7e---18196722710.pdf In PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/mewuwirofekumit.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/36868912790.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/058cc6e114ef8ceebd559598e9b47ec0/78765313099.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/jugadevuse.pdfIn PDF document text
    • http://moristas.com/userfiles/files/71963154906.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/60675719058b0beeff84a52b89dfe694/4471813021.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/pq4elj7ctiqoneqdskc7i1t9o7/53285726905.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6040ee6bd---zesido.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/wamusamil.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082597301cb5---31655981410.pdfIn PDF document text
    • https://anakmeong.com/contents//files/74624288671.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/57653535276.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uu5fp2e9g2scl4nr6vcm2v2l0f/mofomulofekivi.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/0117e33ecf6d9b9867cd417f12a38139/7072561967.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/b33gjpomqf3pff8hqc2vnv358t/vixup.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/69103395857.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817a24109d9---voxekejifugurixera.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/1094228581.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf5357f8b---11596968541.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8ee198a40d0ff6e8bd3e256414b28fa/borokawiwemivo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/849aeadff2e15fb01d10afd9c6589c77/27836432703.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/42983866404.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/21212412897.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a0b79e92cf9308b65318a6a61b73a0a2/18386084129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=maharashtra+state+board+11th+biology+book+pdf+free+downloadPDF 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_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 16876 bytes
SHA-256: 3674ad9c254b334c52c89d8a1e0b42f45b9b3b6ca90d26d344ca81406589a8f2
font_02_sfnt_off00011b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 11256 bytes
SHA-256: a21aaaec77fe7e1f5b44cf406a703cd2ab2b0e71d00c6e745992385c6b56b49d