Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6d5bf321979d7a…

MALICIOUS

PDF

76.9 KB Created: 2021-06-29 14:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e2c14d045c484c42cce21ec61a733da SHA-1: 557d0c1577579c93d8ce643af6132c09ac469611 SHA-256: ed6d5bf321979d7aa5a183ba98507a48b026310ab1747e3bcc326f68b3927a2b
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 with high confidence. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://inwebjor.ru/uplcv?utm_term=vc+runtime+all+in+one
    • https://sinhadventure.com/uploads/file/raxupakosibemutegidumadit.pdf
    • https://diphong.com/uploads/22624569040.pdf
    • http://astro2sphere.com/admin/images/file/zeridefazopafipodof.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0acd2c476---68319695687.pdf
    • http://resetimpianti.it/reset/public/file/gukefudirupiguk.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/814467262.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/soxubitiruvilejozivid.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/849jvmdg7upfnbttdpp89p9gkq/tobulum.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/de57cafea12963a4a2fb28228666dce2/91802089985.pdf
    • http://cokhihoangvinh.com/uploads/userfiles/file/86855871439.pdf
    • http://bkbflooringusa.com/userfile/abbey/file/tiwelosof.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf459d604---83684687008.pdf
    • http://eviljoy.com/UserFiles/File/tisikikodu.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb4c0029d---vidakovujamu.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/u7ls6622jedv14q2a2bn2qab31/85102974801.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/a74a1a796f0391f0f7c27e92b6c8d93e/25122514330.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/2a3229dd67dea9430c12c28cf16dcfca/15284181848.pdf
    • http://tannhatviet.vn/upload/files/35344100870.pdf
    • http://cdwy028.com/uploadfile/file/20210620153714.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706b4b013f6---73746598106.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c14e9615c---soxib.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/4de0898eb961594bcd5a34af5f146cca/74812518544.pdf
    • 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_off0000cb27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 16792 bytes
font_01_sfnt_off0000e33e.bin
5585b6fd88ce71408b662a7de85fe74f278be9f8e751abdcfece85a6731386b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 10292 bytes
font_02_sfnt_off0000fa64.bin
fde3e62e745eb6b04bde71d090d958f2f811d9bf891284303847e4cfccaf24dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 17032 bytes