Malicious PDF — malware analysis report

Static analysis result for SHA-256 00827de2ddd501ac…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 02:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6cd0c50dfb23cab68f25e0b342a3537 SHA-1: 28d53b9ade0ff2e3d9ba63b8e414bb8285da3008 SHA-256: 00827de2ddd501aca8c9ea642eb9878b2c9c888119bc458968bd3c9d18947927
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895d1671c42---12923626269.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5e125ac9d---zejotubu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb2ed34f1---62662129343.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/85c62ccebd142dafda821ee8e99bad32/40609723469.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd243ebb4ad.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/zonijaponaxuveg.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090df58cdae3---lomoxofebusawa.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/xefajusagojanojobelum.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/49f35e87cecd6b8d8cad60279e5f5c2a/pufusijaju.pdfIn PDF document text
    • http://muszempilla.com/files/file/pojupe.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/94573283076.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/kulena.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/votategagize.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/25b04386788c3cb516982451b54fa40d/fusuxutirirov.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/24165629711.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c49c9840bed3d2ec1089da6afdcb0d07/zoxenug.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7ba318ca---zoromomilaritagilipovumup.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1fc3394fcce1912f9fcc518ff7ba7010/wusozuriwinokabusijusosas.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dad3e42210---13182848616.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/jonawofijoxixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=eastern+railway+mutual+transfer+form+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_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 10940 bytes
SHA-256: cf7fb1afb8b2e8ac099e8f07f269139d5b97ea9c5d837bd82bb0c2d624842c76
font_02_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 18020 bytes
SHA-256: 59b12578f0d518813f8090847b9c79f976c81a191d72639caaf0690f1a87f083

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