Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4ce5804bb59be0…

MALICIOUS

PDF

90.7 KB Created: 2021-07-02 09:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 760fe0c9a9ab141ad90ae2e4e527cb86 SHA-1: 8a76d6ac7ce53bd515265b3edebac2d9994bf6de SHA-256: de4ce5804bb59be04355287be8de0c46017aa372efc733abf8492f4532acca86
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. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/49596b122638364f5c28466dc71d201a/11610240067.pdf In PDF document text
    • http://twothirdsmajority.us/clients/38522/File/77302422426.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/18470961757.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/jelisejoregokuruw.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/3349315500.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eee5f96faf---tazebunozorexajamezute.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc61282b3---jejam.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/gupojikazesepalesutobawi.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/23853221085.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a34f094a7---5321317563.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/5d505d7249ba060d10107020cc5aef93/getidifejufatowovili.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/54942800207.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/84853856039.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lawivefifij.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/waxinuniboz.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/tumazovexido.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bb1cb53d---86572859314.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8585ad05---16329192130.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/jituf.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d6b65b83ea---gatuguvonetinoluvakasa.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3cec2fe31---84131480633.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/rivirisemewujat.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/q1h39kopb3dtgds7rnqj5hd88g/23848420602.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b575dd34---30154537759.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/17357418053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dock+and+harbour+engineering+notes+pdfPDF 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_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 11188 bytes
SHA-256: 9e991dba27a237a45063f5f634c413d22d2dadd23ab7131bf22e6c7b65243284
font_02_sfnt_off00012ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDB 17424 bytes
SHA-256: d9d47e2cd01bd8a38404b70afdf64439a0bb331fa002bf002feb0e08d52574d9