Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5027a7c4b03bf8d…

MALICIOUS

PDF

100.0 KB Created: 2021-09-03 22:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c54d908e7e163fef21b6449421a9cfc SHA-1: b4cd517b7f1893d1b461dcf6f6f2796c8db2a9a8 SHA-256: d5027a7c4b03bf8d7173ba2641b05ba70cd8eed3baff2244db922f8e8d8ed6ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent, likely to trick users into downloading malware or visiting phishing sites. ClamAV detection further supports its classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceed423256---fotinebenibazi.pdf In PDF document text
    • http://ehoron21.mn/uploads/files/xunum.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/56428194869.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce066b55fb2---nagagegud.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/28264568223.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062423302819.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/fevumaxixuwesatil.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/39051545640.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3ffb72d98ddb9274c207a565ceb5b864/sajaxinejedanivujususi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd26a735b9---vusodixixivajonoripikekig.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/woropitumarekenuwixi.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/sorunekovoxikolivazod.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160f58891d6365---lidutuko.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/kuzimutojudakuves.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4332874ec---76688327998.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/86925747183.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d540cba00d---junujirineveribo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5c2794781---15077956387.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/padoxutubegobalaxe.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/kixofaren.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/jogej.pdfIn PDF document text
    • http://scro.ru/pic/file/3685705051.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0d7dcdd3e---76235386768.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae24582dd---joloxexifilaxevemidag.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/gokamedij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=karyalaya+krama+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_off00011622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 10584 bytes
SHA-256: ca2654a94e027d92dd2c031aec91e5e85924500fcece623f64465068b55f5913
font_01_sfnt_off00012e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4D 22572 bytes
SHA-256: f1e2b9b64399c53e429030db40c27c85e09ea342d7dba3bcc24eaa86d5c4c5dc
font_02_sfnt_off000169e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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