Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e51618da965368d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 16:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 18b2d469b478f0932cf97516e7058e38 SHA-1: cdb8f6de95a7d0ba2d626c0543025b39d8b4ed43 SHA-256: 2e51618da965368db728cf81e2c7df0a2675d8bd390cb6a08d3bc26167a7d621
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a lure document designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=jine+mera+dil+luteya+movie+download PDF link annotation
    • http://galettedesrois.hu/userfiles/file/61852802661.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/rijekuvisenusedome.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/69904323345.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/felofusiri.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/nerifibefuvagoxifisogo.pdfIn PDF document text
    • https://equinox-e.com/upload/files/jinemenerafiva.pdfIn PDF document text
    • https://phr4u.com/files/77278515704.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/86001676110.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/22123748554.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/91355870885.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/35002213241.pdfIn PDF document text
    • http://teknis.it/userfiles/files/4703986681.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/b1d308be1dc71320bca4812b8c418e67/kuxujegifo.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/digirugewosinemorazezabow.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6dab88d88e486da182c3825fa2e05b8f/51590109358.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/dobudexivozofuvafukawu.pdfIn PDF document text
    • http://ttc-investco.com/img/files/tevupewusul.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/gabamajapax.pdfIn PDF document text
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/82416615377.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/67632471302.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/kaxozosovabinusavudepik.pdfIn PDF document text
    • http://arucax.am/user_images/file/42406520172.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446c3a3c7e0---99445825646.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/xetobezuripuf.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/nufekaluxi.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_off0000bb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8B 16732 bytes
SHA-256: d714c95c9f19fbb4d2d0e391031726f67ca9241b2b190d2c39355f291a3e13a4
font_01_sfnt_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 10596 bytes
SHA-256: 8c68c4b1d13810ba55af60eee82b5e92bae5ae79382a3f346951264507e8bb7d
font_02_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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