Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff7d19c07e55a04…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 23:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be7f5994ea40840e7fce894754c2139a SHA-1: d2d4bd5b1ae9912ba35809be5f9d0639991a67c0 SHA-256: 4ff7d19c07e55a04295adba4c9b1029e863642fed15fbecc0b2b4f82e8ae6e47
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the overall structure suggest an attempt to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://zenobiacultura.it/userfiles/file///woneti.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ef852ecf---54203868528.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/be22054dcb034e78073bb04a731bd482/menaxitomewabubuf.pdf
    • http://bluebiz.kr/userData/board/file/39902666096.pdf
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/toxedavizozi.pdf
    • http://hzaidele.com/images/upload/File/25096627861.pdf
    • http://henzefashion.com/userfiles/file/juguluwonovawuguvazibe.pdf
    • http://jinistudy.com/_UploadFile/Images/file/sasexinanigumizu.pdf
    • http://dailythang.com/userfiles/files/88533912150.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/80703521778.pdf
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/gexofonubojuv.pdf
    • https://ddtoyz.com/ckfinder/userfiles/files/92271688738.pdf
    • https://philly.drinkpoint.com/uploads/files/23581553926.pdf
    • http://standardamulet.com/files/files/babutagukolapulopobitawez.pdf
    • http://vilniausgreziniai.lt/userfiles/file/xesaverojesofemubireledin.pdf
    • http://bajcsidavidfoto.com/_user/file/jererawusazozavudug.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/57411254540.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161421d60dec5b---5983985005.pdf
    • https://yensaovinastar.com/media/files/89977298082.pdf
    • https://fpcofmacon.com/nbloom/fckuploads/file/dutaroboredip.pdf
    • http://sowa-architekci.pl/userfiles/files/jozupokabu.pdf
    • http://kiemdinhcan.com/Images_upload/files/dikosumijev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+restore+my+contacts+on+android
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de6e.bin
01bbde121fc34966ecf78bad3a46f6e9d9f3568500f3e47ffbc0229ca8bae18c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 10676 bytes
font_01_sfnt_off0000f701.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 16792 bytes
font_02_sfnt_off00010f13.bin
7e53b778ed1d2d26c3533ea66363bbd25a542f62577ebc56e828165b433a9108
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 18128 bytes