Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eafd9f3466120bb…

MALICIOUS

PDF

87.2 KB Created: 2021-09-13 16:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 317dec9caf41f324bd08c234f43822af SHA-1: 4cee79afa7c1af20a8c7c23ed24116429ee211b6 SHA-256: 5eafd9f3466120bb0a8934bf86af8950d5da25c2cfed523ac4e196e513a30d7d
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 directories or disposable hosting, indicating a link farm designed to redirect users. 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 indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://studioagronomoserragiotto.eu/userfiles/files/57251189307.pdf
    • http://penzion-u-zamku.cz/files/file/50902544865.pdf
    • http://indigobaby.eu/upload/files/17478062635.pdf
    • https://sukienmiennam.com/userupload/files/wixegini.pdf
    • https://www.autopsrus.com/ckfinder/userfiles/files/ravisusazezobosus.pdf
    • http://siltherm.com/ckfinder/userfiles/files/58681868598.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8b37a5b50---4218367378.pdf
    • http://sieuthibds.net/images/files/zeduzumaganun.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613549a91c8c9---57064316143.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613495d7a930f---xipuxifaxamezapo.pdf
    • http://narcisse.sk/editor_uploads/files/24761856355.pdf
    • http://njxinbell.com/upload/files/1967335291.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/besupizomexajerewexobabot.pdf
    • http://eltdb.com/UserFiles/files/33505688973.pdf
    • https://costarica4d.com/contents/files/wolududiwizukitusuzu.pdf
    • http://hodori247.com/uploads/files/zufedofi.pdf
    • http://pc580.cn/upload_fck/file/2021-9-3/20210903165624974686.pdf
    • http://dataction.org/demo/dataction/media/lusuloniselu.pdf
    • https://commonlawhouse.in/userfiles/file/49897478955.pdf
    • http://energo-market.ru/sadm_files/tawisapisibogulus.pdf
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/xivomizivabilotog.pdf
    • https://abofahed.com/userfiles/file/98967644277.pdf
    • https://zhbiotech.com/CKEdit/upload/files/33758688591.pdf
    • http://shouce-image.kuchuancdn.com/Public/resource/files/wopafog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=top+10+ship+games+for+android
    • http://s250801404.onlinehome.fr/img/uploaded/file/67427021594.pdf
    • 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_off0000f3d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 16792 bytes
font_01_sfnt_off00010bed.bin
48e9584691208cd1b8d1c15d5db0f7cee07b8ba83de48ac0d70610776b60696f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BED 10940 bytes
font_02_sfnt_off000124e6.bin
078080df1b4142814aa7f1d6e7a83c4fcdf81d6326fc631ed9d7a8b8b8598e9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 16452 bytes