Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacf1c1ce15c7a5d…

MALICIOUS

PDF

87.0 KB Created: 2021-09-17 20:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1efadcc7d080338685c1cb6ba50d4e5 SHA-1: 7320c485eb79c95837c4ebf270051b1dd065cdd5 SHA-256: eacf1c1ce15c7a5d6431971905917c1ead0e046749a0e2b2af3a5b6f0c7165b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDFs hosted on compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a multi-stage attack where this PDF serves as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b39cb15ec906c880d15f7b5ead0f4196/bozozowabedenevu.pdf In PDF document text
    • http://mannadey.in/FCKeditor/file/gawefenasirudi.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/45818297694.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/48506946164.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f19e7968eea96e35d4cbdadfd6e4ac28/vopulanujakaromobasarugi.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/kasixuwuwoxajolizene.pdfIn PDF document text
    • http://kelvista.lt/images/files/ponoripanipexodewefi.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109062203536178.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/dufopakufilujul.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/zosazakegisixozowojatosin.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/sedorimemudidirevet.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/supisakizowosefugaf.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///26074306326.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/xagafubot.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/26447288512.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eabf01708f---dubuvakevinekasamikivaje.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6e48b22eddce90bc9bdc802e4526d185/48599250295.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/93185724378.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/33659067038.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/48810077050.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/ditutesupenutewabizidu.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/manobemegimuwetilavigoz.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/53093351910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=green+leaf+studio+android+18PDF 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_off0000c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 10744 bytes
SHA-256: 1b1434a4f216155c7df78d973f69b43e601aa3bfe3b24a949fcb1bea7b390333
font_01_sfnt_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 23524 bytes
SHA-256: 41af3eed846471cf12c8fd1b3c56548342cf8f7397d336ce3d056df80edcb297

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