Malicious PDF — malware analysis report

Static analysis result for SHA-256 3004f2807297080e…

MALICIOUS

PDF

89.8 KB Created: 2021-09-17 07:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d83a643d87c7bbd8004a3bf4e7e3c55 SHA-1: 073337ec0b5a4d5fa47e27ebdda51f697c7ab5f9 SHA-256: 3004f2807297080e6476e778a2faed4171d86848167c9c9ccb03eefebfa54e15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lixupeng.com/uploads/files/54508457060.pdf In PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/25973744115.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/sovefuni.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/78218221559.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/40598147167.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e72f2f2833---43270429940.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/wogofojalekefurepumi.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/97949064824.pdfIn PDF document text
    • https://bem-sa.com/img/file/87443640691.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/d6c3aedac8e5d7c1fc52a6d2382359c9/gixolinavagitijilawa.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/28120634025.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210901053129.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/46626405170.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141c77a64677---32953525447.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9bde1a61b---38309272787.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/narikalefezuzeze.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/77343973886.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/28494585209.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/89602812749.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/3276295056.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c020598987---54844593101.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/01674sc9k36gleg69blaisn6f4/tunikevifidogatawizizos.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/93214370508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=movies+%26+tv+app+free+downloadPDF 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_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 9644 bytes
SHA-256: ae1bf173af78397ca408309d1aec15c959e2fb6b0131f1456ede004e5574ce55
font_01_sfnt_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 17228 bytes
SHA-256: d94a2ecd5493b0b4e51cb2cb524b5a2412880633718afc9246ecdac2e6463a4e
font_02_sfnt_off0001423d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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