Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b49a5ab7d01107…

MALICIOUS

PDF

79.4 KB Created: 2021-09-09 10:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee779830ce183b4307ca2c63dbd57f5f SHA-1: 66fd97668e6e6beb7cb64707a139b1ade3e2208f SHA-256: b1b49a5ab7d01107ebbf9e8f63d1a4f0e74cbb72897475f34288a22f5a3f3741
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. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 https://allytemp.ru/uplcv?utm_term=the+one+minute+workout+pdf PDF link annotation
    • http://youandisagenix.com/ckfinder/userfiles/files/fujajalu.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/19998870449.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364c244bf32---katekaritapepebajumiz.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340d68e7302---7276605173.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/raririmitibekufarekosediz.pdfIn PDF document text
    • http://midel.me/userfiles/file/xekowegixufalobuvazemaduf.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/sifive.pdfIn PDF document text
    • http://vejwun.cz/images/85500732491.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/4030eb41d9e89406899656dcf965a285/pisasegagovujofixoju.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/folotup.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/sabovujovebe.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/89500044047.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/53888673292.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/53847603303.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/33143432861.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4edc93bf---nekarimijomel.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210905055348.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/68891598345.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/24245266003.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210902165924_1743654056.pdfIn PDF document text
    • https://renteci.com/imagens/file/solutepa.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/zamutufixudiwegawajexibu.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40535611400.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/bagubadepubum.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/44549282.pdfIn PDF document text
    • 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_off0000d28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 10628 bytes
SHA-256: e7cdf5772ec426a334337fad74828595b9beaa7ece8cc2c1a100f98e39c78802
font_02_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 17544 bytes
SHA-256: f33af697a703690f8c1dc02a03d8ba168ef0157ad40adeb1a40dde57224a0f8b

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