Malicious PDF — malware analysis report

Static analysis result for SHA-256 60d8a850f03d53d0…

MALICIOUS

PDF

83.4 KB Created: 2021-08-30 16:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db2992c82ec2dcddfc79d75619c69dba SHA-1: 916e7de1ce4ac262f048e7b3428b9427b836c661 SHA-256: 60d8a850f03d53d0c4e680ec511da6c82152e95312c4b7c0d2cbf5c940dad126
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as a lure to redirect users to phishing pages or download further malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4bceab8aa9609fc4eda82da76c1ab360/xugujitekib.pdf In PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf778e3bff2---madimurefagewiliragag.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4707b14a---94964021318.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/59212960823.pdfIn PDF document text
    • https://room12shio4.com/contents//files/libexetok.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/55098225801.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/499062d530be1c7fb2d35573e0ecc3d0/13711693259.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a06190fc6f71eddb100b04f6b34cc078/73438277953.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/disurapomagesasavumuvo.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/h0cg0t876nor0hc2qbugidqgp2/42334571115.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/deweluzotumamurekul.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/5e15b78273f616d78669d581904c8ef1/kizalap.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/pisoropubepisagezonerip.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/dodebibeje.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/04fa87528d2ea13a62b4a78012ce6f2f/fofamaxavorasusisadijeja.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9c9f9d2be---65064193397.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/kokakeselufinimikefofaje.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/2a61793095df82298a8c390b8a07ee2b/nalomibegenufam.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/15331904021.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/munolimem.pdfIn PDF document text
    • https://777mto.com/contents//files/67558177013.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/27370237970.pdfIn PDF document text
    • http://kco.su/userfiles/file/6916391303.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-18/20210518080657435720.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f92f42879---80796029781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sociology+class+12+question+answersPDF 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_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 17216 bytes
SHA-256: ee60cf8cc1b53f4e76aa94918a6c48bc4d0e37e824b2e738246b00cd74099cc7
font_02_sfnt_off000124ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EC 11100 bytes
SHA-256: dfb29a681bcfd073647cc9125d842a7e538bb5747e6df5b028592c03f5a55619