Malicious PDF — malware analysis report

Static analysis result for SHA-256 846c4ee1fd4612b8…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 13:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18023cc5a1164ca571965e786f2ba1d9 SHA-1: 25214bfc7cfc1a36af9c4c47df0dcc399b01a749 SHA-256: 846c4ee1fd4612b8d91a7c30f0fb220b2778ff21ae0ff82f9278af822eb7dd80
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/84167535457.pdf In PDF document text
    • http://ahcxdq.com/uploads/file/201207503286.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/21691190523.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/v46at1kb4fbg5ghdsgk37esrv3/70305993552.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4e3d93217---pulanupa.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/kutaxebutajovataguf.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0d883c7fb---zewedit.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/11698104516.pdfIn PDF document text
    • https://isleo.com/i_photos/file/49914533024.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/16546749472.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/60252676249.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5vqg6k17helc69ccs6ac06gtp6/98436074996.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/kiruwusojusi.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ea71kfapvv7a4akha4eda61594/25139512157.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dcb41c6db---44114442334.pdfIn PDF document text
    • https://ckmandarin.com/uploads/56494265520.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/satubunopif.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/zakonunoguxoxeguzalek.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16090c774a8a2a---17070469755.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7bd931f7---91415346583.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/pugege.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/ripumifol.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/xewerejube.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///vipadujogibis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=violencia+de+genero+en+el+peru+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_off0000dd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 10600 bytes
SHA-256: 58458664cf65e182a3ca09e49ec699a62891cc2f06d0710a2316699431545e48
font_02_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 19892 bytes
SHA-256: d03344cb3cf2ab5da48f61d9e8cea224554915f308615bb62572e9e69784cc7c