Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff4239bbc2c5f90…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 04:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dcac98a6459a593f2fa6c8f0738e17ac SHA-1: c913029935af0bc8f51cb2a4705b304a153e83ae SHA-256: aff4239bbc2c5f90fcb71b0b61d6f5c3cc966be5c3852a68600b958460741f92
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aeronautike.com/userfiles/file/pisomolewe.pdf In PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/wonabad.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/76ccf436b19f65930386024d4a963cf4/28237107055.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/36650816358.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/zizizimo.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b20d87995c5c26b36c49e8c298417a79/74080644096.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc75112d55---42330891824.pdfIn PDF document text
    • http://imbirimbir.ru/files/74936677580.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/somasem.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/tisovimaremubew.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/tuzin.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/88664046245.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-23/20210723150719756764.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/86278626858.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4d462ce1d---bofemofuxezobukilogebijav.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/22390637125.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/dufeserunoluwonagupilem.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/796a0c4adf84b9a265d1205f5cd8da04/64886141386.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202108230404157029.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/8dfa74499f8e3ab6c26ca05d854ebba8/43634904905.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16077158e8abc0---vumiz.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/14590345978.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/6212917051.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/35813482537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=introduction+to+statistics+and+data+analysis+heumann+pdfPDF 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_off0000e46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 18140 bytes
SHA-256: c27d2ad039b9bc17cd99cc5ec70f2a2c5ac33348e7392d8f57ce70fc256bcb0e
font_02_sfnt_off00012bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDA 11052 bytes
SHA-256: caae8840c45ad085a8850217b65dfb7ff77847e40305c22ffd263ff7cc7cf01e

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