Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4de89f509b776e6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 22:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9af0fad6c1520bbd61b3ba780719c64 SHA-1: af32f232f67e1c973eddb21a03c6688f3ae5c4b3 SHA-256: b4de89f509b776e609f0672568f5c10d5764fffb5269955d403b58301b064270
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, likely to facilitate the download of further malicious content. The presence of a 'download button' lure reinforces the phishing nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://leylatoprak.com/userfiles/file/ritubonewo.pdf In PDF document text
    • https://onthespothousing.com/userfiles/file/kanezu.pdfIn PDF document text
    • http://domuran.pl/files/file/vawuvug.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091409213579705.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/82570131614.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/99637539471.pdfIn PDF document text
    • http://djpress.pl/Image/files/duxekokajexinobupepivo.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/zaxaxemukosalarimugoxiz.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6140588100.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6b7910c2c0d8e392156f2b56da9eec67/wonexilikani.pdfIn PDF document text
    • https://tigaintan.com/contents/files/53492596735.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/ranimexolo.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/4967057017.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/fepowizobafaw.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/febufageduseri.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/wefamutonujonuretov.pdfIn PDF document text
    • http://koala-al.com/d/files/35063103896.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/lobumixu.pdfIn PDF document text
    • https://mauspro.net/upload/files/pazabaloxafakaba.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/75466402899.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/06ba5f51380e89f3b052b049f4ba59cc/zuzutisonilagelovozabe.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3594f4008c8001402256790a5750fe49/62280059162.pdfIn PDF document text
    • http://ccadl.com/files/20210907113148.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/xedelizubokefipezabegubij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=telugu+latest+movies+download+2020PDF 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_off0000e280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE280 17692 bytes
SHA-256: bf17d5387af550c4a4cfd6d37505764068693b928af9984e3d1599cdae90bd07
font_01_sfnt_off00010fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DA 10948 bytes
SHA-256: 237cfbb8a25b152dde315fb37d854aa5419796e253e6c25dc5e1c5b2bd5ead0b

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