Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1fb4398151a94a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 23:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4f1cffd611032c53f028eb989e520cce SHA-1: 0eef72f0be5199ec42f2dfa724f446fe5365df94 SHA-256: 8c1fb4398151a94a3b7e5ec8efda68f0a1d9aee84e3bcbb3f8da5bbc9b47a003
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://livres-d-art.com/ckfinder/userfiles/files/wetijamosawifusozidu.pdf In PDF document text
    • http://motolargo.pl/userfiles/file/jamutitibajamot.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/kodobasoji.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/fuvukoxiwelenoto.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/35046ccf3c883895e5c75c5264c54dde/daxukusujobituteb.pdfIn PDF document text
    • http://tw-go.org/files/soxakepozinuwuviz.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3a4488e8eeda0096fb4b41a72b2fe87f/5210879676.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2a604436e659701adf577b7d5cf6784d/66583911945.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9ph0it8g0fqba6b34m7js8sn7n/95134781120.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/kevaxosogunov.pdfIn PDF document text
    • https://geniodelweb.com/file/bojokitu.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-22/20210722202959388720.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d83e459d994---fedobifiwekipupasebeginor.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/21150385272.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5e20c6d1---gerajen.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/93606898324.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/buwofanobesenotogevi.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/27948325040.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161295cfbb193e---76505716279.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606da63bd42f5---rufifadisejuzetub.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/39955320587.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/f2d32b73a24a47cb913422c98d0b8ba7/11905701145.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/17622224180.pdfIn PDF document text
    • https://chv.vn/userfiles/file/62831870496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=caldera+electrica+peisa+manualPDF 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
stream_003_off0000c9c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC9C2 18076 bytes
SHA-256: 688ee1a7d100d3c51b3ddc577e3306cb9f6e4c6bd3b3aa30192d3522f42e1401
font_01_sfnt_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 10688 bytes
SHA-256: 20d37f3a8c6df337c476f85d013dad294e0fb07796912222e7c506312f57bd22
font_03_sfnt_off00011682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11682 16216 bytes
SHA-256: b1431da5899495617365fac0eb84bb4c4a14e490a5f7d5e2226b64e2f0fb315e

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