Malicious PDF — malware analysis report

Static analysis result for SHA-256 1880e92f8e0ac209…

MALICIOUS

PDF

88.2 KB Created: 2021-07-06 17:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c615e6b6dfb72779d2dff64177179558 SHA-1: cd1d6fe528999dca1375f7caf09bf0330f1d6f1d SHA-256: 1880e92f8e0ac209bb99e4b401744b276df698a36cae659c68c3c17ac80795b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cructi.ru/uplcv?utm_term=hardest+puncher+in+boxing PDF link annotation
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/cdj15r1tct8d0ar7v4pu733ut6/rofudezupejogudofamib.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/u86med98pblo7bqj2p0acegu5b/matokig.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88c029eed8---64138697216.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce3dcbab4---gumipibimadu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3cb81acf6---nozeteraru.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/wisegopoxitonuv.pdfIn PDF document text
    • https://ewt.cz/res/file/23232821427.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6b8d9c8eacca011f236ab257817da439/dalidigajaxojufese.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/8e0608cb1b40d44a38842e43242ffbea/jaxirerefem.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d303007fa44---gutazufurarov.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/vasazesagizezubejuneji.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad03c765d42---dejugopatadew.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/mipakotuxonirepudibabakuw.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9e6c97be1de024f38cde035008e98a2d/ramikidobomevasoduse.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f8d640b1b04a34aa42433b48f52955f6/bimagigixasarelepivinuz.pdfIn PDF document text
    • https://ebooksweb.net/files/file/82491437060.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/97675509993.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/91751729121.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/k67utr3i30fhsi3mknp7o7ehg6/58724862961.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0572df2b9e---tawawegolavemodevalol.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/b8bd610fea00d6f2e1f751be62982031/78302507806.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/444a054334180017fb2d2fc446407f42/15808769159.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a944deb53f6---rafiwebusolegil.pdfIn PDF document text
    • 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_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 11080 bytes
SHA-256: 1c78e48ef7fa7e63c75a225d2e2b23f6eccf29969eb728154e560b40b7fc7d66
font_02_sfnt_off00012655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 17376 bytes
SHA-256: 1570f4c289d753dd2f0b91f4c9264a0e363809f635aa0b46f4067db6f5e75139

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