Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d36b14043143f35…

MALICIOUS

PDF

81.8 KB Created: 2021-10-05 15:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c946733c0c0ca711269624bb92c3b6f SHA-1: 51b9a9e87baece5918abd5d6c1e5c890f90db9fa SHA-256: 5d36b14043143f357a44baf3ad694dd203c1536aff7b074c4a7d7d3844434fc6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/af91f210b2f4cb32f3e1bc2c741927e5/domuj.pdf
    • http://autoescuelatosal.com/galeria/files/noxaz.pdf
    • https://attack.lt/images/files/90051275564.pdf
    • https://mmeasar.com/mmeasarfiles/file/fetetisesop.pdf
    • http://laureysnv.be/uploads/files/detunalujadosaraka.pdf
    • http://radiopoint.cz/userfiles/file/83464799586.pdf
    • http://humansharehouse.com/userData/board/file/sizaforesozib.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/xazudageroxisun.pdf
    • http://fitviewer.de/files/file/xatap.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/acc82e0fff6a8ebb15eb2fe1e6cda404/medubebololewidazigalu.pdf
    • http://heydarbaba.org/resimler/files/22442546622.pdf
    • http://kimura-shihoshoshi.com/userfiles/file/vozififafijubub.pdf
    • http://kiuanai.com/userfiles/file/fadodenilujavakavule.pdf
    • http://jatyn.cn/upfiles/202109/file/1631185861.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480cbc5b7e3---lipixogowugazixowoxuxew.pdf
    • http://villapellegrino.it/userfiles/files/nujevobotitemojadada.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/puviwo.pdf
    • http://rosesrealtyhomes.com/userfiles/files/77720454703.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152870f7c003---85099203812.pdf
    • http://didopack.com/files/jatifopuxulef.pdf
    • http://rcpolypacks.com/uploads/dofeku.pdf
    • https://meridianchem.com/meridian/ckfinder_userfiles/files/wopax.pdf
    • http://mayepnuocmia.vn/data/ckfinder/files/degiwodunetogajuvat.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fussy+child+meaning
    • 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_off0000d444.bin
469ee9f4f52a45558017ebad7122f482d98493dd2342bc2c43dd4e3ca50975fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 20376 bytes
font_01_sfnt_off000109bd.bin
1eaa7f23f3894e7793c85b395d0489a7002535ecf567404d83255b24c0dbbc91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 10692 bytes
font_02_sfnt_off000121d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 16792 bytes

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