Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0d1da69deb3be2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 19:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81d7a2e6b0610eedcd4bb3a771ce370b SHA-1: efb3ec78a6bbb6547d812c78e55570aa7438eb9f SHA-256: af0d1da69deb3be2e0bf1a3c43870f73adac66def8e09a9f9879eeea2f0c000b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links on disposable hosting suggests an attempt to obscure the true malicious destination or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synphabase.ch/upload/file/simatomad.pdf In PDF document text
    • http://yeongwonenc.com/userfiles/file/kesevaradajenike.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/nobizobumiru.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/16291863449.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed96c567f---ludoxoxelozomitofilo.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6703bdd4---19333797930.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/50100525296.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/78011233081.pdfIn PDF document text
    • http://bakoca.hu/files/file/vusokodapibi.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/8169917142.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/20200159368.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/3315068679.pdfIn PDF document text
    • http://precisao.org/files/files/nojesozuzikoxejapunotomu.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/pelida.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613037144161e---xojoro.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/13183262527.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac013130e7---78752073843.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/10063786230.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f7f88da8a130df423289ec2f6e9dc071/89579191824.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/desugesale.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/17889567657.pdfIn PDF document text
    • https://luminex.pl/upload/file/javoniboren.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/lifobimax.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/63035372860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=call+india+mod+apk+unlimited+moneyPDF 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_off0000e1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 17932 bytes
SHA-256: 2d4e4e044907a4d7d452a69b4e3cc2d5918124e2e03eb910c9859dc0375eb767
font_01_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 10624 bytes
SHA-256: 40c15d99e81f51a4a66fd4709d86cf91e5a25036c2ad7e43896180514b223581
font_02_sfnt_off00012928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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