Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15edea18088fb12…

MALICIOUS

PDF

73.5 KB Created: 2021-09-20 07:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7daa84a34da76c8c9bb9d6dd1905e1fa SHA-1: 4af5ec3a82489759053ceda47cadaa4b0f1d3a46 SHA-256: c15edea18088fb12ce7f8878e5c60034bdbbf411837b2b9b4ef52abdbbf33a20
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggests a phishing or trojan distribution intent. The presence of UTM parameters in some URLs further supports a campaign-like distribution strategy.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4113

Heuristics 5

  • 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
  • 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://vico-domrep.com/ckfinder/userfiles/files/62938947996.pdf In PDF document text
    • http://jowinbio.com/upload/files/202109042043109677.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/15011549538.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/13201309348.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4e083e82c---16591562999.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/38659191833.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109072333447412.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/52328680754.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/15676c5033687ed6387077579cbf7073/47403110197.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/16644474944.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/o3vf27td0241tjpgtms5nocis1/96804261568.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/suposo.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-2/20210902220911304919.pdfIn PDF document text
    • http://erpos.sk/data/files/marefilotukikuk.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/vasopovaderi.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/39645120845.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/muzedunititedonus.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/31145458575.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426a9b8272d---81529620078.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/10499564515.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/renive.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140a4b186fcf---tusunas.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161368fed084eb---xovuduzag.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/nutaditateradazuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tapety+na+telefon+android+za+darmoPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 17596 bytes
SHA-256: 42d172265838ce824ce23cbe84ceb8d4686a715450925f7fc92c24595a55a842
font_01_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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