Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd49a442d3da3484…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 06:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08085e0095243a745a162c87a308ef60 SHA-1: 706f8742824ab3f61a695ef863471a50e1506261 SHA-256: fd49a442d3da348478a17661b476642a20a4820fab63a4988c0d86c1d6186deb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://jocafoto.com/fotos/file/kosupidonowalapazefuba.pdf In PDF document text
    • https://bahceneryaman.net/public/content-images/files/17573210685.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/timoliweperolawobexunen.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/6771079382.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/ruruxizaxikefig.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/wuzazigake.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/23384163386.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/40081504237.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/wakevasarivesatofu.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/fufenixafekunididirarova.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613672056df6b---66331569331.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/51527808314.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aa22c7ce1---72097953311.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325c45e7fbb---19079444413.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/37304442239.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/59067131906.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/67920935560.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/vitazi.pdfIn PDF document text
    • http://space-edge.com/upload/files/31577210974.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/kuwozebenuwelilave.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/84778874064.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109021258168784.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/vumufunapamofek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=apk+infinity+opsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC12 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_01_sfnt_off0000c49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49D 10100 bytes
SHA-256: ef198f32abcb50555d421b83bd94617b136c6d4ffbac6bbf50f670de183c8cd8
font_02_sfnt_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 18868 bytes
SHA-256: 4a15ee2e555deaf9f501c8e5fb6f379a844b14c9a02dfdc75924643c897b0225

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