Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e8a2f94bcc0aae…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 18:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 652dae32e883c375f45200203bcfb70a SHA-1: 614af352155e9eebce3d7bbdfc254ea180e45637 SHA-256: 22e8a2f94bcc0aaeda36b9414b9ae95b04b8fda62e440f4468ff23a37e87e574
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=pubg+new+state+beta+apk PDF link annotation
    • http://masan315.net/board/imagefile/file/8124914576.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b499907f79---19663232505.pdfIn PDF document text
    • http://goldmustang.ru/files/files/73498722687.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/leweleralan.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/timesede.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/1899379732.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/pasuvujudosamupudisikula.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/31945612745.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/37731879284.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/35521813604.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/dulubizu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab24bcfe2a---74308011714.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/3400899360.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/58936634107.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/sudalatatemos.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16140971ee4ce0---fibinokezilugomuzexido.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/sejorik.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/tolebavanagovoruzavavu.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/jovufutijif.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/xunawota.pdfIn PDF document text
    • http://vejwun.cz/images/vepefezirilalukemejif.pdfIn PDF document text
    • http://lejonhund.com/upload/fimowesakefekuk.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/73426049435.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_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 17128 bytes
SHA-256: 9b84f7680f537be49aecaed759d5fe92bee88d1cb59bc4b5bd306e38aea73726
font_01_sfnt_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 10488 bytes
SHA-256: cfce0a5a089342630a75abc85b791bdfc2b3335a935674241a08f9f670660e04
font_02_sfnt_off00011fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1