Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc50a27450518bd…

MALICIOUS

PDF

75.0 KB Created: 2021-09-13 16:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8059d5995bc3e9cce690edcb6f46906c SHA-1: 4e2b627025517b50ca552b1ca9deee5d52cbc236 SHA-256: efc50a27450518bd1836da2ae003a840a87ab1bf5c15bcdbe9529bea27e995f6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classifiers and ClamAV. It contains a link farm pointing to multiple disposable domains and compromised CMS uploads, indicating an attempt to redirect users to malicious content. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://brilliantsolarpaneling.com/userfiles/file/vedixegepegifisu.pdf In PDF document text
    • http://snuhonors.com/userfiles/file/49826627375.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/3541785860.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/66102967889.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613744aeab901---31505810591.pdfIn PDF document text
    • https://semut73.com/contents/files/68636792901.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/nisediv.pdfIn PDF document text
    • http://megalaserasia.com/upload///tujizotezuxen.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/lagidikepapusawage.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ecffb0a376cc49d5404f3f6a3aa5efb9/69973127613.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/julododamegefijis.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/xaruseduzukoxe.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ee35320ae2354c4f2548208b376453d0/85619215604.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/99063786239.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/28915302.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/73721261835.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vukubo.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-3/20210903045848135897.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/49574103406.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/jajogenukavirosikeruke.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/zones.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/2113354549.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/54960272398.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/gobetefovaxusasatekoril.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/vulevivagubonewevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+delete+chrome+history+androidPDF 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
    • 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_off0000c1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C4 10828 bytes
SHA-256: 9a72e967b518a9b87dfb0c27a257b11d4e232a1d44c59ff65168d9036133569b
font_01_sfnt_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 16828 bytes
SHA-256: 8b6a9387bd991e995937b0022ef954a5190b02416f30c73436f4aa088dc9ed09