Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d0186ca7d43b88…

MALICIOUS

PDF

71.7 KB Created: 2021-10-01 05:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: dd6c1d02c030cd7c73c35a17ca36f580 SHA-1: 558846f0e52334a0b8c3b209c46fbdb0611d23de SHA-256: c8d0186ca7d43b88b628e18e764c7d8651b91f33f19eb3533855d9ee94322d2f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which appear to be compromised WordPress uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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://mtt-association.fr/upload/file/lipobog.pdf In PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8f538a8ade7142e566ea9300e4b10857/56290186033.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/lalorafovawovezunev.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/76535476317.pdfIn PDF document text
    • http://besteva.com/upload/files/bozawumurejokidi.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/kenawotewipijajenuj.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210916115540.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/kutinesuv.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/parejiputasudukigepa.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/fozuruwunixavovopebo.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/58298291517.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/f17abe46efd63143060e496fe7c3376a/86967955060.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/59397121150.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/63531792689.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/6ick9o5irb5v0g2irm29t16tts/sapiruvazejozaj.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/bizefovezewajibalivux.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/90480839243.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/mibuvixebozexuneperavexon.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/zakobegudefatitasakuxa.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/7508161608.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143ff160c55b---62600578502.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/deludo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161391dcf50f70---pixeperewigolabowuxub.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614022de1f92b---vununowefuvarodexinenufan.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/83327092712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=como+desactivar+accesibilidad+en+androidPDF 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_off0000b772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB772 10768 bytes
SHA-256: 31224f252bc7366f742d39a79aa8e3d4fe23cd5ce37d4580790586de34fb72c6
font_01_sfnt_off0000d042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 15928 bytes
SHA-256: c25adec741263777007624b3d2bae91dfe37423a81931d7810e8dface7fe8880

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