Malicious PDF — malware analysis report

Static analysis result for SHA-256 740abc69411f1dd3…

MALICIOUS

PDF

81.9 KB Created: 2021-08-01 06:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f96d26687bcab893d9aedeadb573f706 SHA-1: ff323eea72423ec5bb2c73ddd5d558d96168a104 SHA-256: 740abc69411f1dd39abee112192953eaa3504c0b5ba5170e9bda183d768f5d99
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains that appear to be compromised or used for hosting malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091abb8ee901---jedaximejexuviret.pdf In PDF document text
    • https://toananhmedical.com/uploads/files/tisukoxeperavu.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/qd76tvcg6dqbsdrk63br2g61e0/24186218778.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/98105190529.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/78689497056.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6908c2fdf6---vebawizesufabivesemum.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/06d361fba5a40b7f06bab28503cb005b/61397170140.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608312f7a3f51---87953099777.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/f2cf3c990e6363ee2045f4463d12af1f/memaxeferelijelaza.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210730_19D79D5D08D78CDD.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/damuwosedegaxafuludofufi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b63710bb4d9---dukakafowafaxe.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/bikeropovepovet.pdfIn PDF document text
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/74588498973.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c1j3mulvnujc2nik81ip2q4p41/gaxokezemilutafitup.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/ritapetebal.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/gusop.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/bobemadiraxinatimarefe.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ha60irvpko89p6b80njac8rq04/larezofarexokije.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1874484b---33695417692.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/tlob22uoshte8s602s1rkl551l/pibidinujufevarinilixazeg.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e350956705---zarujafasifakivoku.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/24160700201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+use+poladay+cp+35PDF 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_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 17432 bytes
SHA-256: 93702336da04bb13444b1ad3a0193df5778f0cdee5caf7fa480165b1605f6bf4
font_01_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 10808 bytes
SHA-256: e865d541e529b5ecba94370eee2c9b9c69d0a0acebce9cad851b26c8f3dd39f7

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