Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb938d3c591aa40…

MALICIOUS

PDF

100.0 KB Created: 2021-09-19 05:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00638f2c7ef431e6b0af1ea0ee632870 SHA-1: 35a166ce7c4cb194b0869213bf3cdf8b5c8e8d6c SHA-256: 7fb938d3c591aa40ae848c0dab4a0c8c4c9d5b126f179d594adcd67a809821c1
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the attack pattern of luring users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://synerhu.ru/uplcv?utm_term=free+movies+apk+2020 PDF link annotation
    • http://akiisushi.com/uploads/files/99188775070.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/42683740686.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a6d96933a---60763335610.pdfIn PDF document text
    • http://montesantangelo.it/files/files/rulesime.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/loguxagakavepilufolipepur.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/29790428872.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/29892805542.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/masamabax.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/70055542405.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/41351370534.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/29c54858df7f2adcb26cf2b38bd79f8d/nixedobapixonekarudawax.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/24604094040.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/39psltqm2urlnv1geamactfjrh/30339175412.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/dibatubedusaxedavox.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/44639599274.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/22286678681.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/91807708899.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/koluvupadodewa.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/46065211027.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/pipiwasopaxaxirevuwogeso.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/regetowopiwu.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/zanijup.pdfIn PDF document text
    • http://ruihuitax.com/files/file/fajojazotojubulibaw.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d07b068e---xojepukexitisakozudu.pdfIn PDF document text
    • 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
    • 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_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 20432 bytes
SHA-256: 59cc25ae044a676de826bd1f0ccedcb9080043e6b70c9511a001540ac1297728
font_01_sfnt_off0001526b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1526B 10540 bytes
SHA-256: faa02533e28f0a72bb62fd4c9f8f167406f86157fd54f8674c707a574d7060c0
font_02_sfnt_off00016a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1