Malicious PDF — malware analysis report

Static analysis result for SHA-256 554ef9b250ed249f…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 03:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e32f6cab6da3b742c343ea9de8806768 SHA-1: 519e80ddc52eab3c83b094c7f45a6dd48cd5374b SHA-256: 554ef9b250ed249f134599393cf409acc70d51db92c5407daddb7d32d420c0db
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly indicate a malicious intent to leverage these links for user compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://michael-dhom.com/webseiten/file/25600838066.pdf In PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/defolidorimo.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/99506423526.pdfIn PDF document text
    • http://evola.it/userfiles/files/60959689516.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/86307881018.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/judofinalopuzozekidabipo.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109170551241151.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5080240d4---dakinexagofokami.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/9692217612.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/gijubisibure.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/nazisufopadudewixukinen.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/jinulewebut.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/rikamisuwuwul.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/wepanexemuferolemimanave.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210904210145509.pdfIn PDF document text
    • https://12shio4.com/contents/files/36109830334.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/kunegopetibupij.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/49704968909.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/gisureladapaxes.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/wikiximeditirapibajodasef.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/jirolubogufanixelezovabof.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/gugawewadomerinozifaxo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2631364b---vefazinemezelaresil.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317e83458b8---9565025311.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/pakaluro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=why+is+my+android+going+straight+to+voicemailPDF 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_off0000ce24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE24 10988 bytes
SHA-256: 42921bb0f4ff335a67f30edb012d144e0a7019edf05cc56233aac5aea1f277fc
font_01_sfnt_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 17296 bytes
SHA-256: 2982790daaee94f5f236e438f54083d0f173fa8c76b83153594a484a9d6b4539

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