Malicious PDF — malware analysis report

Static analysis result for SHA-256 84796e00bee24b95…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 18:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d9d6dad82aa6eff623f27d959c1a8b78 SHA-1: 3dad715c65263ab748acca82d52095f4f29cbbb9 SHA-256: 84796e00bee24b953a732f05a10c32dd7b7533be01976d109e2fca4adf60d1ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting it's designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pacantioquia.org/aym_image/files/66866802776.pdf In PDF document text
    • http://ediljolli.com/userfiles/files/xubadijajekokodugamog.pdfIn PDF document text
    • http://www.centralperdana.com/file/94267927007.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/8011777902.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/rakut.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/708af6c11e643ea6a9b0e8cde29b4d97/tewuwunotokunezufaguwigo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/40579514483.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/35687531053.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7ffc316be8a8db39abec23d84a1c8341/10589998997.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202108181411362083.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b46aeb2e7fcec8d42e8c2aee2bfd5791/vosegogexusikegejinavoraz.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/efr8h8m7bjvfecp0j8pi0uumh0/gipefinelofetubakig.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gisapeli.pdfIn PDF document text
    • http://houselandia.ru/files/72815957411.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/44539660411.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c878dede69---33587763212.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/bemiloridavimomisosax.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfffe89fde9---dexagop.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6dsh36muv276pih7dnnddnld2/13278160536.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/fesifipipafomixamijosagaz.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/3441072549.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/69994598885.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4c303483d3dd1bc3c6e80a62c121cd3e/mimilefogewizax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=merge+word+and+pdf+files+into+one+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_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 10752 bytes
SHA-256: 798073b1b4ef8d0520cd638d374b5e18b2d57057a432c4db351a702aa5a0aa01
font_01_sfnt_off0000f1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 18076 bytes
SHA-256: ab97f6d5bacefe5669041bad45d0c83bbb21d821b2ce37efd808bc122d1ebcf7
font_02_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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