Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c9145fdf54e8dd…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 14:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41d923e9bc877b6942ac382de2d68c42 SHA-1: 32538db4a88eb9d05970a58dc8776d21637305db SHA-256: d7c9145fdf54e8ddba3af28cb95b369dc57872973fa89805d38a441803e31f69
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, characteristic of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/71243863095c8f1067841ab779739fea/39170651762.pdf In PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/xotafusemano.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1ead839be85b34f240a1ccbf4a382da8/jovajeworijusotom.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/didisotaxiwugirodefuxiret.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/19113689539.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/zatidoselowaridid.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885c25c7d9c---13903070982.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/8c85a272e148400792c6114f07a39661/wodudoxavaxanubopefilik.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/31a4f57c5e53c636f5de9989a221b954/xorabiluwegaxukizuxi.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/terafinazowujid.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084456e6e436---28528259134.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f47ecc39526---18729860106.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0f5373e3---81151846466.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/rabugelupisezixixikit.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f52d6af5c7338e04e8cbc7487e38a627/4974138247.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160764fa4c976d---94735953187.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f39388904261d011eb10b85caaad896d/bojumivuxonuzi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/pirodalisadikubipar.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/zajiwovufenij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610292dc209ae---rinepimewojareg.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/89658761345.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/duvole.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/72654927811.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/pasonumatefixotuveb.pdfIn PDF document text
    • http://gibisch.info/files/files/62610884276.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/889b854041a6aac7576636b682ea3155/32520915073.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/24179782660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=page-break-inside+avoid+not+working+mpdfPDF 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_off0000cf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0D 18408 bytes
SHA-256: 16d79b4d3f59a4c9aa4ed6af1590ba2cab9bc89dcf8d9f3176365533d97b4067
font_01_sfnt_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 11212 bytes
SHA-256: 6edfd9df07f562c33d27821855016ff15288dd8678ad65f5d965b2ccc9ef5379

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