Malicious PDF — malware analysis report

Static analysis result for SHA-256 b719b41ec3d624fa…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 00:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4776cbd1bb829be15984b0e2ad5af243 SHA-1: 2943f75d2284e7e2f0396977644804fbf1f16e04 SHA-256: b719b41ec3d624fa539469343054c0874c3e7b85af8f6176368fec23575f28b6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to compromised or disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and numerous URLs are characteristic of a lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mondoaudio.it/img/uploaded/file/beseborujixuxenim.pdf In PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/kejalube.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/90453365884.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/dujazirobiwaperafokow.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/36031363225.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108262049208483.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d94e56a93---mefizoguzax.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/16497766302.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/39763884867.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/geworejakatafem.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/9374432926.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9edf89dd902be28b9c2b728c0204d29b/dikejupezi.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/72473673463.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/17931940175.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744d1049080---guwaxazolexopovobi.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/25895161538.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/petenuwarexavukozu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d20c4a4797---34328694400.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/k7q80iishv3askos5tt9815tt6/79315175545.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075bcaae7f6b---rizejigozomawomigiso.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/1ib1e2ceqm9d6es8lkl9n2nvni/kalunew.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/rosatotuvoxutit.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/10700394840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=golden+guide+hallucinogenic+plants+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D0 15112 bytes
SHA-256: 06cefb3bfc52563cb0ae689f240ae7fb83ba719bb9e23bae3b6f57865023ca33
font_01_sfnt_off0000d957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 10940 bytes
SHA-256: fb292c25100d4869af6e45c0e58ec6e8f7807aedfa4d5da5c28c658fda62f3b0

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