Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a479a09e2cf191…

MALICIOUS

PDF

84.5 KB Created: 2021-08-16 00:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f089e2529ca222fffa8e0f1992314d1c SHA-1: 01a7532b4696762c18e8a15dd58573f8df92245f SHA-256: 92a479a09e2cf191299ad058c23a152d1707e34277a9c64d86513865cde70cb6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1de2abc72---foresuvusuv.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e96909cbed---77118149057.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/pulirazovojobumuro.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/mufolikopibezugidesu.pdfIn PDF document text
    • http://neonyazilim.com/images/Media/files/32163487096.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210807_025358.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/069c342211a3591d3552a1abeb4e23ce/zedanaf.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/togitisolo.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a45453bb239674a77cce6846a0ada8b4/jofabozi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095baee27d33---14683735524.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/dilibimisonazigedoneb.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/fijiwevilibax.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609867060e893---juzavi.pdfIn PDF document text
    • http://blueyee.com/upload/file/070756195642.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b870fa950a---sejewosimal.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/s5k995gebh36r349u98vnl6m1l/24800965338.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/727da0c4bd1b0604583de3ce5a8f43ff/rakutesudo.pdfIn PDF document text
    • http://klefmarken.se/upload/file/51373344057.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4212fce8b2---46787333684.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/jaremedobapuna.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18303726305.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/jitakuxeporesuwufawuvor.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/e45630bbe70c61eb3f234b5af88d7595/7595939180.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608acaf30eb51---20888213045.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d725d48fb4c---bifudizikodito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=nj+dmv+written+test+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_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 10592 bytes
SHA-256: 07ce37612b6a6eb01e0da8b23c25468c63ae67f1ce0a135fc2793ae8e04f4cd7
font_01_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001178a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 16944 bytes
SHA-256: 790ad6dc1d33e42c6b02412e77e5d3242dbd13a4c44d2f91c5c1fa4d5e9ea4a4