Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa99bd896f1aeffc…

MALICIOUS

PDF

87.3 KB Created: 2021-07-29 21:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b7be82459a803fe0341ad57f4d8e921 SHA-1: efcf02b2840461bcb70ab8cde3d6569412fe9d9b SHA-256: fa99bd896f1aeffcd91da54a4030480d298230bc588da8e4ea701f2f4126c69e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to other PDF files, some hosted on compromised WordPress sites. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/bikikofad.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fopesujel.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/vosuruvamalunivonevotawiz.pdfIn PDF document text
    • http://446888.top/userfiles/file/sedinedededupijeforeben.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5adf85087485f612a736a9d9e6da4565/tipipobutunetalafuluw.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/kamenelokunaroguburi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/3b60463e7ca76611d1cdba5e4d1de913/dipoweweritateb.pdfIn PDF document text
    • http://demirtepe.org/userfiles/file/vuxosepuzabolimu.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/takevudaxofa.pdfIn PDF document text
    • http://canoeing.by/pics/files/bogipukegoja.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/82659929920.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/0b509aa48991dd4c6401674e8b7d752a/vawota.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/gifemubotus.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6365596c---27725870727.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/takonolonosafisojuwerom.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/1284072442.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/lufinorutemowonisu.pdfIn PDF document text
    • http://ashioke.com/images/library/File/39994162633.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/vesunumabonajega.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a03665df7---23455032051.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/47846918607.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/pokixafibowitowekiti.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/nukewulujurigasurux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tamil+typewriting+finger+practice+book+pdfPDF 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_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 11188 bytes
SHA-256: 1ba835358005562e547c4d260f7b80da724562a90279d72b6e543aa3879e3619
font_02_sfnt_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 17864 bytes
SHA-256: ee0a3bb64fe8e2e52121112ddddcf6bd2a77da2873490268780f4657159adebc

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