Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb28f17f515a619f…

MALICIOUS

PDF

86.5 KB Created: 2021-07-09 02:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aae52bb9634c9c0afed8e5f2ac26fdca SHA-1: f9d5bf9f233ea74e3046e313383256d8506d8457 SHA-256: eb28f17f515a619f2816daf2e71f270e65adcae732142272147f6e90316641d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://arcdesantmarti.com/biocop/Images/images-editor/file/88908079531.pdf
    • http://aircond.md/upload_fck/file/sasojixusanav.pdf
    • http://didaconcept.com/admin/fckeditor/file/tuxokitejanun.pdf
    • http://baraanduliaptti.org/userfiles/file/vemomadulow.pdf
    • https://abe-rdc.com/userfiles/file/21599290175.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/4mj3dbnvhbt7lubn2cvg73ikfn/90813560872.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47f183d680---biwoniziduvikefotiw.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/cb681bbe866628a1f414ede2c448a00a/20869213584.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/o94dd7toh1l6r4f9ptr7na8lc4/68995797845.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607361b4adf7b---wemebanek.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0ff61d29eda710df745c053f4b72a3bc/97616298450.pdf
    • http://mispuntossaga.com/campannas/file/vizumaxovawutoviro.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/19egp6apm9n58gusm0qt3lvoo7/fikajivivuwuwafopadenuxiw.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/77529847767.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aac97ca1e20---gemumo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609285923d104---jitipukexitulutuz.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/78055f15a1ca18766f2b756b07045577/19371029984.pdf
    • http://ankaser.com/userfiles/file/20507415453.pdf
    • http://guowangcable.com/d/files/pesuxagejuwavi.pdf
    • http://ahlhy.com/uploads/file/160904525375.pdf
    • https://ecoretras.com/file/vomakatawipavi.pdf
    • https://essaidafm.com/uploads/FCK_files/file/91795592543.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc778af9c3---nuzagozeg.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f4084c598---67970459467.pdf
    • http://aaz.sk/editor_uploads/files/86503742992.pdf
    • http://camonetinternational.com/files/file/82701995297.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12fb3c9190---10861137868.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ghost+location+in+gta+5
    • 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_off0000f03b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 16792 bytes
font_01_sfnt_off00010852.bin
a3375df95f9383734976e493872b8f3d2fc3f77fb04895963ab825661013e556
pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 10452 bytes
font_02_sfnt_off0001200f.bin
e04e3ed70d888b34c4de0de10766d170bf5e05b9df14d3b8b06010c233ae6cec
pdf-font-stream PDF embedded font (sfnt) at offset 0x1200F 17088 bytes