Malicious PDF — malware analysis report

Static analysis result for SHA-256 53418b112bf56b05…

MALICIOUS

PDF

88.5 KB Created: 2021-07-01 11:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94df9de4f7569076aa926c9c627102e5 SHA-1: 14ebd8bc6f24d6a7cef1b6ad131893cb6f33a923 SHA-256: 53418b112bf56b05464dd5925cf4066b7b66f793094e7c0d2437d4ec6d5adabc
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to lure victims to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://kipia-nn.ru/userfiles/file/8613982352.pdf
    • http://booklandbooks.com/userfiles/file/69429956650.pdf
    • http://classicalgardenfountains.com/uplds/file/zaxuvaxoxegebokogito.pdf
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/49959107591.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077173453eb7---midapulibov.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff1aa91f5c---21652021376.pdf
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/ruzon.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/aefd361a29e83079ee0602c43164f3a9/ledit.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0800655f---vewuxaf.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086346a26607---82835501793.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8a151b4940f35e6b6968fdac9a6aa5e3/66894214914.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb6327aae---veseletisamiwusew.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/t73h5d5bq7ls0a34h18dtr74hn/gamawolafenoz.pdf
    • http://polimak.pl/userfiles/file/wezime.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098c3a50e9b4---fiwozodaniluginoteri.pdf
    • http://kayapaliinsaat.net/file/51201075005.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b619cae6cfa---rorili.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5357fe6035e5606296e4296e17149db7/mudoxedu.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608408dfcba52---nerafufabalagudeseguga.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3dfd20b20---80526786784.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084333e3936b---xabokaj.pdf
    • https://clickkedai.com/userfiles/file/15940512322.pdf
    • http://baohanhranghm.com/upload/img/files/dumaxibepejov.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hebrews+5+commentary
    • 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_off0000f632.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 16792 bytes
font_01_sfnt_off00010e49.bin
450ca2ca2217f66bfaa7cdb769f73c87895500a0845e22bd859d67ee0f48f105
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 10720 bytes
font_02_sfnt_off0001270c.bin
eea52ddb9a9e5d4fcc554b72d04fb0e91390eee511e2a93c4644aad8b3bd5df4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1270C 17496 bytes