Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64b7429376e58d0…

MALICIOUS

PDF

73.5 KB Created: 2021-09-08 05:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf20c7a29fd1402d4c8729f34840975c SHA-1: caa148a630c7922f7306515c3c0ce72ab2f7cb2b SHA-256: d64b7429376e58d0a2b1ae3310749a2fabdfa20ecf11433f4f5ebe39502895fc
204 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and a visual download button, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. The primary attack pattern involves luring the user to download a malicious PDF from a compromised host.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://haozuowenwang.com/imagefiles/file/silorofifivenorexibusoziw.pdf In PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/46299000550.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/d88kte6t9hbdkkagc2e1579ita/82742951730.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/baxofevodufuroxiz.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16102b1a172ffb---30093474542.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/mototuwuvujixazonopug.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9925d0169edf0f54125ca23b33229b29/74882881647.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085c1eebe7b0---45776936716.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/wubatoforemogawuwul.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16086130570bcb---14540319669.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/sobefukamuxozafinizan.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/najesupajunizumow.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/lularusoge.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/bnbhibeujahp7e1r6mtpssgokc/tefebetatujodajaget.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210827195324557052rfgf7b.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/fepikuxoguzigulik.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/timodarote.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/50329526855.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e64b7f47---wewefeponovi.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/13048920609.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/kutimemuzidedezona.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/witogunonuniromaberulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sinhala+english+dictionary+free+download+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EE 11176 bytes
SHA-256: 715536d20cd520bb4b3492f8c6509e473cbf0dc851743fe3b7f3f3d2d4e8870c
font_02_sfnt_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 16980 bytes
SHA-256: 2a1ef18257cb5ffa14e2c5e912fbc5ea32e68ccd889a0b1b2301b93ae3ccc7ea

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