Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4896a5443c2d78…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 09:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7631af7448973e017cd6c6b659ec3187 SHA-1: 340885a196d513141ef75aab011232305d5edb2b SHA-256: 8d4896a5443c2d78ed99f9f88744d3b0ceb98d21f91691bb0d2e32ba78b124d8
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis point to a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=tekken+7+obb+file+download PDF link annotation
    • http://mariautonoleggiomarsala.it/userfiles/files/letuve.pdfIn PDF document text
    • http://namngonviet.com/user-/files/xiwonaranobuzi.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/35904558774.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/93078612380.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ii0d5rin45bbmhru8nk4c1bbc5/84310680802.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210910232252.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ggt3ta1c6i5v1a4i1s5kapmuik/vavilerigafe.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/dewarelizefu.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/53941469343.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/kasifusub.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/mifixesog.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161384b10708a5---61588398737.pdfIn PDF document text
    • http://xprchemical.com/upload/files/kupumeteb.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/retutimezaviwipoziwexi.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/taxututetasobitizagavaka.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b6b8de2f6f5099bf9b9a4209f014ef2a/nojakalelavuja.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/13567657907.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/69620239634.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/20225291826.pdfIn PDF document text
    • https://bdata.vn/upload/files/32781089674.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/93033371471.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/60359724062.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210910_234606.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/fapimagajamizagig.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_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 17516 bytes
SHA-256: 18909f24c077925a93fe4514ae2db3a5f802547bc0a42d8df009d7764eccf05a
font_01_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001326a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326A 10312 bytes
SHA-256: 8e98f6c8446f1b22b0c06fa99f8d130708fb621291ef57e283ce84e659344976