Malicious PDF — malware analysis report

Static analysis result for SHA-256 caaed04907686b7e…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 21:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8c4626c4393fec817f8ff3f8230e18cb SHA-1: 8800aca4dbe945cdef9cc894e39eca492d1f777c SHA-256: caaed04907686b7ee401c9bc929c80d55a882868c1f2ada4df225a03f33b5fd8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories, suggesting a tactic to host malicious content on seemingly legitimate but compromised websites. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607843ae13375---48590518205.pdf In PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/250da9182206990ddc8b415eb9afe426/88336343690.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161077b69d0c9c---34078733400.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/a9bb5e3406fb6992a3f5f9c1b5c56bb8/xuxefiresisumozivisumugiw.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/c2618cc059d30ac9dfd9376e454e3ba8/28541307212.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4061733d3bee46573cc81ff1dc23d751/zonasosupagamujudafipida.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/37c15bae36bc076189b7a81873678b8c/lojimotowu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/foketuvonepu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jagifefom.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/43820667117.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160785d8d8bdbc---peweronub.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/64680139975.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/19128907368.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/kipifumojiwug.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/bibava.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/mijupararilutoso.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118a80447297---xififogopavegon.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zinizaputewumusebudoji.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/2584487779.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/ridegekoradoxizoj.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7f6e9164---40398820996.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77be33902---82161998987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=trauma+craneoencef%C3%A1lico+pdf+2019PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • https://doi.org/10.3659In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 17244 bytes
SHA-256: 7badc61f47237e1af4cb963df312d9fe54f6f446512d5a58ae77038bd8c1572d
font_02_sfnt_off0001028c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 11220 bytes
SHA-256: a88190223e5b597924be3e06bd520e7ed693ffb31b8264485aeaa3f7e1544a38

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