Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e262d6448e88de3…

MALICIOUS

PDF

100.2 KB Created: 2021-05-26 22:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da2d81f6347d714d3ffcec3cc10ff6fb SHA-1: c2aee86546d3ce7d86e0c4d51887311b10286547 SHA-256: 8e262d6448e88de32c4937e6f7cc78663162f607c3c359622f7e750dd77e51c7
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/8e4bb5c0f8d080f1e81d1c9e10bc3f6d/nifegu.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a91f2923a80---ribijejuxalobujopufedu.pdf
    • http://alituncer.com/userfiles/file/57756706999.pdf
    • http://industrialdevices.in/uploads/24309418280.pdf
    • http://charivne.info/images/file/filituvosajovuruwatawur.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/20e9843e75fe5220f840db0596bb40a1/nirumemovagej.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5dd257cee---wugetoxabawo.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079906bac9d6---48791444003.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a330a66bc664fd31c4b2235302bbcee0/sazut.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa36489d33---fozebarokimuparija.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f18405e0d4---rusidosevaj.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797dd7d695b---wewom.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab980aa69d2---57721007525.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/fca549d5ef8317cc2bb8ccbb95edf53d/99655148745.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/27kgfr9nuntothd9ceocp07mts/kajowiwezibetorebizab.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/gvoj1gmm083go02evqqcl3s46m/fesoxuzubofigule.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a28c69a0---35837787640.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=why+is+my+samsung+wireless+charger+not+charging
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d19.bin
3aa997750fcc0bc42730cbbc70e0cf66159b054c2adcee4d6970c02ca21dc218
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D19 5300 bytes
font_01_sfnt_off00014f08.bin
fb6a0678a3936b617e145df1a9181e0c64a7e066f04b4901327926ac119f53a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F08 11340 bytes
font_02_sfnt_off00017539.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x17539 4324 bytes