Malicious PDF — malware analysis report

Static analysis result for SHA-256 756a054a3e50186c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-01 21:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34b91f8b0513863c1cb254ba385e609a SHA-1: 8d71fde2e3d1bf10c7d6d35395019ed708e00a00 SHA-256: 756a054a3e50186c89343171b3e2376637b5d0bca3be88e4eac6599bc9f28905
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, directing users to numerous websites, some of which are hosted on compromised CMS platforms. The presence of many external URIs and the link farm structure suggest an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6830036551b200f1fd9ca6b1b1e6fcb2/mexijesigiroxigalodawo.pdf In PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/161d22742fc2e3f89825b1d32667234f/pitorawatupiwovavepotele.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/40959401023.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd768867a---79911657763.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/54807911840.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-13/20210513083405109597.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/bgv87eegbmd3q1f4sbjfq51be2/ridelerimonofezogegiw.pdfIn PDF document text
    • http://cycling-software.com/files/file/4399468498.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/toxidi.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/teguximeletapenonekidagi.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e2cbe7603e9da4cf77e8328f4514ff2d/30571017763.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ed06bbaad---23993024229.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/93586338795.pdfIn PDF document text
    • http://dc-536514926e84.632.ch/ckfinder/userfiles/files/nafanefigadobekovuvazezo.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/lelaxemixepaseruj.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a38382f8a7---wilexinajarafu.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/4883873579.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/75898749137.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/3232845191.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/mibabozudirovag.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/17324836519.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/jisigejiki.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/122947aca7947a3a62211dfdf2a09425/63844264013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=reasons+for+leaving+examplesPDF 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_off0000c408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC408 16452 bytes
SHA-256: 5b422fc25d8e56777b6783e83afced4d979bba00e33526bc62ac7ab010042e91
font_01_sfnt_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 10816 bytes
SHA-256: 1daa20cfb51ccfb29edc2421bc6afc803d71e2a1cde44587a955ccd0ea1cdf75
font_02_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.