Malicious PDF — malware analysis report

Static analysis result for SHA-256 8253b95df6a53860…

MALICIOUS

PDF

97.0 KB Created: 2021-07-17 06:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 071edce00a38b2b81c6b174ac2196d54 SHA-1: b8e0ef83199498e88db4ab96ba24309033cbfac7 SHA-256: 8253b95df6a5386058f8deaa141971398b3362cdffde2c7d6fd3b8f4ce943a2e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest an attempt to lure users to malicious sites, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://laser-piskovani.cz/democms/userfiles/file/tibifanomolate.pdf
    • https://apsco.ly/userfiles/files/9244803027.pdf
    • http://musikpark-live.de/userfiles/file/piwaxowupukexegozu.pdf
    • http://esebtekstil.com/resimler/files/xorodegiti.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b203e4cf565---mekitibejemasegosekita.pdf
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/50730469098.pdf
    • http://sdds.be/userfiles/file/49932011226.pdf
    • http://orthocarecentroortopedico.it/userfiles/files/jolifu.pdf
    • http://bigxra.com/uploadfile/file/2021051208175973499.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/6cd02d605d648eb391686fbfeddbd1a5/nuxewewinipefasese.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/41d45132a3f583d6a0f0388df4913cfd/83223399455.pdf
    • http://ipceurope.com/assets/file/fikubevomefafojugexojidur.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/70baa76b3ddf1052bf756080b3cf3965/6514540767.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4eca1b43---besotokaxapesipalopu.pdf
    • http://rbtyutj01.com/userfiles/files/3049536614.pdf
    • https://vvpta-irvine.org/userfiles/file/86075642541.pdf
    • http://bualuang101.com/backoffice/upload/files/99993523620.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa613bbb79---munawumoxilusukimove.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f040d5ecdb8---waxopegatugatoganowijaka.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087180e6d832---bejigi.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c48ac1ebe66---73123281724.pdf
    • https://nevisnews.com/userfiles/fozuzut.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/89657619317.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=x96+mini+firmware+update+android+9
    • 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_off00011658.bin
5bda442454a66df02f5757c1c6fd89d201f69054c6f6d66926a032ad86ae0634
pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 10976 bytes
font_01_sfnt_off00012fcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCC 16792 bytes
font_02_sfnt_off000147de.bin
f04cfe9f9a7771e2d4988b20d2fb8e2edbb1f7582c798a1ddf2c6d80bcc33989
pdf-font-stream PDF embedded font (sfnt) at offset 0x147DE 18264 bytes