Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f0ebe1cbaf59f6…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 06:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 060b77eca43d796c27957f1ed48d411f SHA-1: 88ff13bf58d92e76ea8a84f498c7c7f9a84e91b8 SHA-256: a6f0ebe1cbaf59f6e2300325d2ff596d69345b542aefb18bf094d37d73a331fc
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 by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23cfda197---tupadamaw.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/eh666j0o0e5mht7dgj50ufb7j2/4506870310.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/d24c56101c37c5f0524d86c1193ae4ac/xowujitulesizadugajedo.pdf
    • http://taiwan-casters.com/userfiles/file/tivugarepafovosugiv.pdf
    • http://davidhammerstein.org/userfiles/file/56028274380.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/2a55f152dd0a382d65c939b081b12a33/kamewux.pdf
    • https://egokituz.org/files/galeria/files/21074805240.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/31a60bb13c6888a6a02d4c1ec8d5b25a/85378002895.pdf
    • https://stopserv.ru/files/file/12455360508.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/f114ce0o1tm1msdka45hsihv9c/kaxinitenazomijilegokub.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/0mnanumhhum5mp4mddlnj6p0q0/nezepirogapufosaxijiza.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5086a48fc---zitafagedona.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/54aae22e6d079d3afe5f5bc5a25182d2/87320898407.pdf
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/pelekutitujivotevixab.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2eca7a27d10466f3f6b857c2ff47ac8a/laxinozipedetivimanekufid.pdf
    • http://cuspsurgeons.com/userfiles/file/29934522185.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/pc5mk80fqatm75ldlotc6k50o5/bumilakiwofosevafosafilo.pdf
    • http://agrobud.net/uploaded/file/66130572249.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/gisiremafefezizurokal.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40d3122f4b---59134468175.pdf
    • http://lyshiying.com/d/files/lirejopa.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/867c821498ee3b48e7cc14cbcb307ed0/73982654490.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e60c35b5b0553fd3b1f19bf067d2be42/10194616607.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/79881379961.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072285c26da4---76314446411.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=yellowstone+ranch+darby+mt
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e59f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 16792 bytes
font_01_sfnt_off0000fdb6.bin
758edb0a1312dffcd0cc87207bfba7d7ead3b5f9d45cb0448eaddd6e98a4b225
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 10868 bytes
font_02_sfnt_off000116b6.bin
7636135c39110dd20046a44e189c2ce736d4ff4cb210084be6c88ba3fd21d221
pdf-font-stream PDF embedded font (sfnt) at offset 0x116B6 17360 bytes