Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15140365ec759bd…

MALICIOUS

PDF

74.5 KB Created: 2021-09-13 00:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e8d06141f3a9474d4c7d4361c24b73fc SHA-1: 8c56110b1e95581ed092ae3370f129085ec5f4bb SHA-256: d15140365ec759bd83960b7f82dac8d184a686b84aa933b4ab3972dbd3c451d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF structure contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or spamming campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute malicious links.

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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6bf2bb0891b86ffe4cfca6381d5b7c70/jodek.pdf In PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/kudifewulixup.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c1ee96746f4ea0e2c4540898d92f6baf/27849386672.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/keramibe.pdfIn PDF document text
    • https://ka-base.no/images_students/files/begatufagi.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///91411769376.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/fopaguvulozifazixose.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df0de1b082---gadevej.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/zedarevutirenozovekiv.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/lugogijanosukudomilitulas.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9d9a8e47---faretizalalu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6af5a31dd---21345839421.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/11911176204.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/dukimibegofabuxurenidusi.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/18117925020.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/11516979544.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/netibuzuzorofafewigixuf.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/milawuzixonanok.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/mulemibemuga.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/rivujoleniraxopakesoxalu.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c4796f805---28437339475.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/xaxoxoxoremawig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=just+friends+2009+watch+onlinePDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/lewixiwuda.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_off0000bfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 16696 bytes
SHA-256: dc2e4e775a46f18654fefbc2442d606312d697bcd6c5fa7f91a116c9a8394318
font_02_sfnt_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 11160 bytes
SHA-256: 036b7107c37f4a633d2ac07a251e0508f3b8de2c52b2d749a5ce99366bb8b1f6

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