Malicious PDF — malware analysis report

Static analysis result for SHA-256 3952890da13c44cb…

MALICIOUS

PDF

92.2 KB Created: 2021-08-01 19:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c4266837e4de86ba2755bec2f8c0841 SHA-1: 3a4e210d0a84894432f806b16d4a1704a4a49fbd SHA-256: 3952890da13c44cb48486b76681c6be5aa4c36483f4a0504d122c44f3aafb756
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b7a090a11---xiwagunaja.pdf
    • https://digireg.pl/upload/tabazizudavutizodi.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608141d89736b---terikeluxuz.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a52f9b70bf---mefoz.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a81fd0a02---75499742214.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/paguxewalivejopavul.pdf
    • http://degrossier.nl/uploads/file/nirofimapuxij.pdf
    • http://huucodatlanh.com/userfiles/file/lewuwonaxotawebev.pdf
    • http://quickvideo.nl/userfiles/file/diburepajezeti.pdf
    • http://kingalbertltd.com/uploadedfiles/file/widonabuturuz.pdf
    • http://ackerviewguesthouse.com/userfiles/file/woforikovadidozegevibonek.pdf
    • http://tznjl.com/userfiles/files/5665234163.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43dba30ba---93535981621.pdf
    • http://cn-noah.com/uploadfile/file/lifabisatufif.pdf
    • http://studiotecnicoprato.eu/userfiles/files/82468251034.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/586d47487103e75d738eaec1ce7a08b1/10183717998.pdf
    • http://voxel-avocats.fr/uploads/file/43160950786.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fc5ff20e0---4622965559.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96e5669bf---80236787652.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/13848346925.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed978a92a---32144218447.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d99505fd1bbaaccfad8851617186be50/41198553105.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/abce3ad0e148aeb2fa091aba7c08b4f4/xeguweloxiwizumurema.pdf
    • http://weforyou.it/userfiles/files/nerepobijodolifepuxofem.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ejercicios+de+fracciones+propias+e+impropias+y+mixtas
    • 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_off0000ffc8.bin
8a5d8087dec0eaa8ffb7e44f824107a0580b81a471cbe09f5ac1de0ec6140f1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 11064 bytes
font_01_sfnt_off00011988.bin
f732f17b51f90b03388d2180ba55066f41bfb438504ffe4f4d68cff00a547d18
pdf-font-stream PDF embedded font (sfnt) at offset 0x11988 18688 bytes
font_02_sfnt_off000148f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x148F1 16792 bytes