Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbffe4c5f33325b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 23:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b56c9662672ed1889133b58983fd5618 SHA-1: af620c4e7f1fb2cce2dfb7801df1ef3487af1f53 SHA-256: 3dbffe4c5f33325b6ec82183e9a466c8d771c9e599e6a872cbc0af65f25eefbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://huntic.ru/uplcv?utm_term=mods+and+addons+for+minecraft+pe PDF link annotation
    • http://ahkkpcm.org/userfiles/janup.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/mujegevoduvefobatanaxemej.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/46789211106.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1622d352517fcb4bd75a6329dbfc7df7/xinuwuvatelosabuduf.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/25663137683.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/nipufigadatiw.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/6a6eab8845d69cecdc88952a83e76c8d.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/lexesorevowetunasokad.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/nurok.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/fu6kuk3bifkaujdbc60p5nj6cr/lexini.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139445b835df---20322669770.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/suzerol.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/zuxirozizofiwitik.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7d8482a61---97654814697.pdfIn PDF document text
    • http://www.bash.cl/media/file/lopaxiruvupojuvovi.pdfIn PDF document text
    • https://asken.as/bilder/file/rowulelutisuxeludokefevu.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/30409132658.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8376aced079c1c71c63df890004261a2/87626059418.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b0da9c59---28309071428.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ce866e14---50618214404.pdfIn PDF document text
    • https://hotelcorona.ro/files/38455920753.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/72771042079.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5d77eb06---27521839197.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/bukam.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/wuwur.pdfIn PDF document text
    • https://parkettworld.com/upload/files/popagekatebigasawiron.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_off0000c0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E4 19408 bytes
SHA-256: 39f1ff27746897ff12d0531424412d3c701bae4d25ab82fbb2d70e3e1f13cc27
font_01_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 10728 bytes
SHA-256: 5e148fc25e3421510dd9cc7b3f64beea841b0d29f98f0f5ce8b7c4025ab08208

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