Malicious PDF — malware analysis report

Static analysis result for SHA-256 42853b08c18228bc…

MALICIOUS

PDF

81.6 KB Created: 2021-08-10 18:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1fa9df602a558d7d54231c50339d3014 SHA-1: 7b69206c5f80d265a3a1cc882f12149d0390696f SHA-256: 42853b08c18228bc116a50fd9ef8deda2810f7d717cdd6596ac533ffd5c44ae7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://diplomat2014.ru/ckfinder/userfiles/files/tafigizorabiwagirupok.pdf In PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/dofinid.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/67393330008.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bcb14b681---nefejagopekanidesibigudo.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/9796071441.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160712705b9951---68876431010.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/48603225933.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5a93ef7a3aa2c3db6f27707b653affb5/64472976050.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/38658839618.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104bed4a071d---vakisojuxevenakosuseros.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/nenopubij.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/7eaa4f606b476633c717d6843097f321/gitag.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/87671568376.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/27837732891.pdfIn PDF document text
    • http://santeh.md/img/files/281153749.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ler0rhsb5kjed1v53p424b31nq/gumimetep.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/koxedabosafusaf.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a26741075e2---zopimeleguduvaxibajimepif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f834b3ee49---50480003974.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2b078eeb5---5018257690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=centro+de+distribuci%C3%B3n+oper.+metropolitano+cdmx+ubicacionPDF 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_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 17380 bytes
SHA-256: 1f5dd014e2c53e04c3b2d19faea27e9f4e79e1b21b597c145c26f716b12bc08b
font_01_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 11252 bytes
SHA-256: a2f4954223bc99bbe810c67e32eb7ff821f4234c7f3b4e58530ba9bba5b34fc1