Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a53c6c19b9f07b…

MALICIOUS

PDF

93.4 KB Created: 2021-09-04 19:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f2d661f5174e9ff7d21e22d49ddd46f SHA-1: ece7c3b89ea1c4309352edaa1d146532127bb719 SHA-256: 16a53c6c19b9f07b32735496fe714bbdc71bce774af137a4e8107a0b95cd6259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users into clicking them, leading to phishing sites or further malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=kral+arms+puncher+breaker+manual PDF link annotation
    • https://marblobaths.com/app/webroot/img/files/30728137859.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6bb0d2ba---kexipugow.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607072854bf6d---zisit.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/95c4f5b8d45814930c112f40af74cd84/79933704611.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/66544370612.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/zigozojejeg.pdfIn PDF document text
    • http://chapelguild.com/images/usr/81284737825.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/a5e9mdomnlmcdefiok5c6dgd81/85976233669.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/du2a3mf34nq5ddjrktssim29fg/vokugunemafem.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/63517918653.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/3783199957.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/810548286.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e26b5659d---80506297686.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/kezasirixirukedopatek.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/42gna50piual26v48gm18jttcb/kitoliradikenuvaxovawiges.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/sezekinemoxodu.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/71c9d2c1beea6d6cddd49fb65abd6c93/7962381003.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9340cb2549700d1f4c73f008111cbf41/dopaxivasiwovidi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8ed3df72d415076a726fe6ffee1aec21/17985325189.pdfIn PDF document text
    • http://119pump.net/d/files/mobujizefumeriwoxisavodos.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8d9c2b211a73cd8daf8c8e7374763151/kimevisefalelupexigi.pdfIn PDF document text
    • http://halmar.info/userfiles/file/mogofowufa.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/3108052612.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/nujegazaganilaxavekaxep.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/xibapewotij.pdfIn PDF document text
    • 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_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 18188 bytes
SHA-256: 4ff83dbc368a9ff942ef4a9b945c1f29d096a2c60e6267f423a61d0da1564954
font_01_sfnt_off000137ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE1 10652 bytes
SHA-256: f12bd045113cba5a9586c72ae1b4477e339c09bff8df99396875b4afeb336309