Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c2439af7081ce0…

MALICIOUS

PDF

96.0 KB Created: 2021-06-25 23:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fe0bc62d137436d27481a90f8b761db SHA-1: 029892a0d743cc7cbd7907df5c66b7f8e95d3383 SHA-256: 58c2439af7081ce070dba5b1de12f8b210e74158f5039c875c99b3d668fb5da0
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to various websites, some of which appear to be compromised, suggesting an attempt to trick users into downloading malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bakoca.hu/files/file/95102364302.pdf
    • http://aimic.com/userfiles/file/52306261942.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc35d3991---vinodi.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e1a67eee4---82638988498.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfed8756a7---8436815791.pdf
    • http://adamlegal.com/userfiles/file/3442303571.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/noi9avrje04o66acae9bgekk2u/xasaladajopixexug.pdf
    • http://gyobel.itpublic/file/17740186880.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609207534ef64---pisefabujifawomiriw.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/vlv4les3b0nb7559840enkaomf/wesus.pdf
    • http://hutergroup.de/userfiles/file/lapofawulijuga.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2cbba8a1265a2c0f157544362b0c1b7f/dujoladitizizemupog.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9940b8eac---7502514447.pdf
    • https://kompaspt1.com/contents//files/tajagigapasuw.pdf
    • http://eprdel.cz/userfiles/file/gisodumobov.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975635c74c7---41850498363.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b3534ad87ba---kiwedolujurubetigarofamup.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/74094a2682c47b43b8862041cb32d881/44535919652.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ab0566a37904210acd5122b050f88d36/52652809188.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccf4ecf422---medoviwupep.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/dccbce03ac45f994b47551d0b8799a15/numiviw.pdf
    • http://rolmech-strzelno.pl/Upload/file/bulejizujewifepimamoru.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/jomurowipijaguxo.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce442ca2be---35524466030.pdf
    • http://insureatkk.com/ckfinder/userfiles/files/18604969593.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mac+extract+one+page+from+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f62a.bin
5201e23331e02ad101e3f647b402c7055df7197bf51474d1217ecae863e1505f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 16884 bytes
font_01_sfnt_off00010e89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 16792 bytes
font_02_sfnt_off000126a0.bin
92b648269f7973e319e4e3af38c3fb7cd0b1e3ab9177f20d84b11a1086e8cf20
pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 10752 bytes
font_03_sfnt_off00013f27.bin
88cd6f34aef162f54362fe9d2dd789812c8b5798f277de9c933eaaee69e5e600
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F27 20008 bytes