Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b18f6f09b8cfdc…

MALICIOUS

PDF

74.6 KB Created: 2021-06-21 12:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3847fe05133473ca4cba8c7e46dd8c88 SHA-1: b879058415b952662c408a1c3a6433d77e866559 SHA-256: f6b18f6f09b8cfdcb80f484081e5e17907cf594f8401714b793692447510698d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body text is heavily obfuscated and appears to be junk data, further indicating a malicious intent rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=best+starter+hero+raid+shadow+legends PDF link annotation
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b351d88a4ffd1d181b0658ce3f2ae506/86892677506.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608079894fe77.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/3963196859.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0ad5220d32a311ad3c095ef30e6a712b/45182728431.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/47973981499.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/ab4b55189752760fbf7026cec021b457/nisunijujalewuk.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/3c4a6423dcd4bad66c130c61868e8775/mikizowabixafifodotomufid.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/85455437380.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/86109975355.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/dd5785b5f31d78cdaded66fc6fd9feaf/62162156383.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751fefe52a8---71279169927.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c41c3b3e517438b1757eb699f844aeb7/72471209887.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f2993c0d8979b9866d5654438410a808/zobewuxefajizob.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/79db2dolbr795nld83kl6g71ih/26689678077.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/30398118469.pdfIn PDF document text
    • https://people11people.gr/uploads/File/pijutizezepunaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 5228 bytes
SHA-256: 29173b69ed840c3aeb1c5bf958091b7b84f7205786b9b43bbe30a4a5b95ebf11
font_01_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 10600 bytes
SHA-256: 9f826feefe4dce8a764ae2c74c3bd228e30736a5f047a312879fcdeef4ded646