Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6ecb14d92fe409…

MALICIOUS

PDF

90.7 KB Created: 2021-09-02 00:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29573223f4cef07c69d3e1b174eb5093 SHA-1: e942ca8b3602ff7efa8ab0fa179f2ba1759a3da7 SHA-256: eb6ecb14d92fe409e41d45bf3c05bfcfaf19bf7d19dcad2c845d16a1ef6ddab1
164 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised CMS uploads or disposable hosting. The presence of these links suggests an intent to redirect users to malicious sites, likely for phishing or to download further payloads. The 'SE_URGENCY_LURE' heuristic also indicates a potential social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=agriculture+trivia+questions+and+answers+pdf PDF link annotation
    • http://sieuthibds.net/images/files/fimigorapejuzavisivewemer.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f93a4a1be7---jijawapiwese.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/75754267051.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/rikofusebamigefobe.pdfIn PDF document text
    • https://samowar.me/upload/file/82760803356.pdfIn PDF document text
    • http://domplus.su/userfiles/files/soranukuxekupemonamo.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/88740441112.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/72663719398.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/042c3f2c0672415df35f9b00406ac8cc/paloramuratojubit.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/71473355811.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/24016517024.pdfIn PDF document text
    • https://12tiga.com/contents//files/28121883887.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/80614358650.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906f1679dc5---nugoxedarar.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/78960081754.pdfIn PDF document text
    • http://ladna.pl/user_images/file/govujevaj.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/46887490620.pdfIn PDF document text
    • http://alltechsro.cz/files/lamujiwukanafe.pdfIn PDF document text
    • https://ebooksweb.net/files/file/67222774513.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/xopurodasogesuteb.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d1c31814ea88ae481574a4652c2ad9cc/71578583576.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/xuduxutukajajuwalaximo.pdfIn PDF document text
    • http://socialsipahi.in/assets/ckfinder/core/connector/php/uploads/files/66746455627.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93dcc77e3a---lubinuzek.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/vaxikutibap.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/rapomepirovuwalofamali.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_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 17948 bytes
SHA-256: 8e718dfe81d4997f2dd1c432ca2d4ec4950fa6aea628a003104b34bd865293eb
font_01_sfnt_off00012a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8E 11172 bytes
SHA-256: 73ef74448541d56ec85f2cf74b48573413dc13cb25c2346df521f5bad508aef2
font_02_sfnt_off00014466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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