Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dc8398161ff5b0…

MALICIOUS

PDF

83.5 KB Created: 2021-08-14 02:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 225ff953f06be84d5231f147063c95cb SHA-1: ccfacffdeda3db1ee4ece1c8bd7f141a635b9ee4 SHA-256: 16dc8398161ff5b09c1b843151718c0f232dabd9c5c2a8ae6f7bad4d4672b7c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=2006+ford+focus+back+seat+fold+down PDF link annotation
    • http://ecandrychow.pl/Image/files/52387559149.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/mupoz.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920f918293a---roporijixefivu.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/wegidokipobezonubozewuxo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2563884e8---11796403855.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/magutikidomixukulajiz.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/64e13fdadc4e30c002b7b1789e4cab8f/nuxepukupogedo.pdfIn PDF document text
    • http://rafaelokazakov.com/file/gatasatupuzojurukogami.pdfIn PDF document text
    • https://moolans.com/uploads/files/vobefebubunufo.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/18562147299.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/tijozeronagigegosekos.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/33146190192.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/32610158088.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/48175898347.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/lifuripovugapofovim.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d297ec311---10470667049.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/34107190312.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc12e53112---52519231467.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f36eab178---54338846627.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/melozadamovadafenenuza.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/bitukulirasaki.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/58807251972.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae72029d605---dimebavarakadaxenunadate.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609081908fcfc---wobidefesipufun.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-5/20210505091911627952.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_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 16836 bytes
SHA-256: e2963a4cc9f1f2968bd21827bda69eb4120924ee169f57b6efc3164930d5cb0b
font_02_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 11108 bytes
SHA-256: cfe24cf453e79eff70dd3aa9685667688ea69b50f6ed2ade4ebecdcdba687638