Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e77fb80620c43c…

MALICIOUS

PDF

95.9 KB Created: 2021-07-02 09:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d1c998b55f159d55bb50416a56daaee2 SHA-1: 82517be5a456b8eb8beb3fb78a0de6b100d8c430 SHA-256: e5e77fb80620c43c8fb944eabfd08df793c40d52d7e4b1dd6fe3c83bde5e23e5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting it is part of a phishing or malware distribution campaign. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of external URIs indicates a redirection attempt to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://exmar.it/foto_fck/file/60075332931.pdf In PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/96013152698.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/55345802576.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087ac44305f8---dijamixamulakimavuluv.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acd04da6b94---42400072526.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609416b183c82---roruwusigap.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/mevunopomewabiduv.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/nizikorerepij.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/65623430594.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/razerisakumazevuvitufuwok.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f7f42a63e---14592638088.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/998cc94058f7aa9b758d66bfd6eff3ce/1567532449.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ec1e5a6f0ff73cecb2a7d759f452cee8/50325793323.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c82b1832b---lilimunarotob.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/79bb749f44dc2877879927b598212f25/nomepag.pdfIn PDF document text
    • https://ksuskalology.com/images/file/21445055004.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/t1dqcdu870sd49354c70vqkm00/jamakagidalu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdb81eee37---bedulog.pdfIn PDF document text
    • http://banquat.com/userfiles/files/4841885509.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/56493658649.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a08a2413---90255022840.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e6c4c05dda23eb02e5fd65d0fcfcbb74/29018345125.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/26660961891.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/voteforosemom.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/belitetadaxerupaz.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/mulimotosanadaguvokunajab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=blood+bowl+human+team+rosterPDF 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_off000113f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F9 10800 bytes
SHA-256: 2dabcbef6fc70406a424f49f870707f37e7a2fc162786b84cb68cc9185908f52
font_01_sfnt_off00012cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC8 17188 bytes
SHA-256: 0667a76b52198c870083b219e6e4d678cf2fe4d54e303cebcb04c9cca70b83c8
font_02_sfnt_off000159dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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