Malicious PDF — malware analysis report

Static analysis result for SHA-256 befd6be22b6900b7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 03:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2579bb70887425970af131e2830bce3e SHA-1: fc413226ba873e2c2227f85489b7e51e5496a544 SHA-256: befd6be22b6900b7885ad033132bde08fa103c6dda0b6698b27137878d9604cb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs strongly supports this attack pattern.

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 http://theseadiaries.com/ckfinder/userfiles/files/kewajubiruwabokodiwowexi.pdf In PDF document text
    • http://liubeauty.com/luutru/files/13747848600.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/gomabov.pdfIn PDF document text
    • https://guijek.com/userfiles/file/28369531883.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210908_CD449914E131EF15.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/88437330871.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/63635973273.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/9402912727.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/g9nbm7mp1b6dohn43g9i8i4d3m/13858464280.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8aa58d92---kukotibazupilivo.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/botufifiribax.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e5bb90653---96763767536.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/buluwozuxadagavapejukep.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/56430573584.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/54891897234.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b5e75888f---28531661306.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff959a374---16982763903.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/76670964162.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/doguzozedupe.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/9bgin620tlt21pt2t6g7ime6tl/80545416055.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/73195544126.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/90568816709.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/garebifezawavozuz.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/rajusubek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=language+difficulty+ranking+for+arabic+speakersPDF 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_off0000d212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD212 11196 bytes
SHA-256: 6d5f7c6b289e63ce11260a8b02caa78f8b666c2b7792580d57a8483e2d99c04d
font_01_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 17852 bytes
SHA-256: 9ef4425171e378bd54b71c24dc355fa8fe3ce367430ed284433cb78bb6962b58
font_02_sfnt_off00011a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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