Malicious PDF — malware analysis report

Static analysis result for SHA-256 861a10dd1ec67255…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 01:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a77914f8a6157e37bfde05ceee4706c9 SHA-1: 0bfa27d19f83f16790e8a2b2c13c7ae427001a9e SHA-256: 861a10dd1ec672552e47f3171302f8bef7b164d4825dc13cf2c6a36530cb6c21
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links on various domains suggests an attempt to obscure the true destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ecohost.ru/pics/images/file/zopojepukuso.pdf
    • http://geombiagioschettino.eu/userfiles/files/fevobeno.pdf
    • https://branchennachweis.eu/userfiles/file/60308616065.pdf
    • http://dribblebar.pl/userfiles/file/tojovolinobinizi.pdf
    • https://acryl-bg.com/userfiles/file/xiduposuvinaj.pdf
    • https://lecapsuledigian.it/file/71714121749.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/94595786419143283b7e4fea0c7dda84/latat.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/85449495162.pdf
    • http://sakra.sk/storage/file/56207177742.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc2ead278e---defaguruzuwotudafo.pdf
    • http://dynamic1984.com/user_file/file/78030394261.pdf
    • http://xedaptap.net/userfiles/file/guxaremew.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0ogqo8ocgarl8g1gu020bvq776/41162964180.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/38794128803.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/5ed75ppae63nb798okmfi9c91s/suxerupomodatiw.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/844e78adcaa2f993b281c7fbdba3fa5b/86558664368.pdf
    • https://laetitiabernard.fr/images/file/12163220923.pdf
    • https://fcksa.com/ckfinder/userfiles/files/94002923887.pdf
    • http://photo-preiss.com/upload_files/files/bavezukazunanorogurofuvis.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca5544d85f---megobebeni.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lm9fm5s61fjp84n7sbb35ac738/26684233376.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4sjv682k00uu68lsakhss3r8m8/18037718764.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/sfk8cgkpjhvcrml2pfls7ipiq0/sumadoxo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=all+verbs+list+with+marathi+meaning+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_off0000bbcf.bin
f185b9e478f7a33cbcea3511d25f8c1e96e6c1c2909f245132a5f562a653f34a
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCF 11100 bytes
font_01_sfnt_off0000d52a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 16792 bytes
font_02_sfnt_off0000ed3c.bin
50e67838d6d7805d6975589a3b5754d3dc0bbf229e01d5caab4700e6d7bbcd6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 18960 bytes