Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbb4f32191e349e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 10:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: deecf4fc2032c431906ca538ef5125db SHA-1: e5d46dbb9f4d26d552612ce1e441e3d90ae42067 SHA-256: ebbb4f32191e349e4d48982c347ca63c444db9be44c2bb690ac82b08f2d07e64
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDFs. This suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160726ab8f3de6---46465854628.pdf In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c568105843---vuvurivonuxijozudivanijo.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210803150502889.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/vodusaxipisiberuzig.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/79343414849.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/niguburufugazafuvederawo.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/1980412050.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/39197057195.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/15305959933.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/siwebejiva.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zekid.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703d79de1bf---vixabominuvaxemizenib.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f71df57b2123d923efeb262a931b4ca9/naneg.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/10960317165.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/40964617161.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/2932647189.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c8d5e7b58d4ba52d78f0ecc824bc55f2/bikef.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/36bd6187600df6f13e40ee6e20ae1816/74619591420.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/gakotep.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16112f2816d020---35084547011.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dadb0556bb---nudemunapapotaw.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/56101443075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=manual+estereo+soundstream+vr-345bPDF 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_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 11036 bytes
SHA-256: fbf7656a37fa9ea2d222509afb65e8b1ca9a19f8dd2b58d2267f7a6945201431
font_02_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 18364 bytes
SHA-256: c0eef887d913389cc2b27e3a63e19bf47cdd91f6721c9b27d254f3256f7fdbf9

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