Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8adb918bd27d5da…

MALICIOUS

PDF

75.9 KB Created: 2021-09-24 02:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6f27ad198dbf0d2ea72f392eccff391 SHA-1: 504e5f696ab5729401de9721e1e202566b559baf SHA-256: a8adb918bd27d5da2c7bd47b584ff46b12b001e32f38cb17a43b0aecedbcbaea
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a 'clipboard command lure' heuristic, indicating it instructs the user to copy and paste content into a command-line interface, likely to execute a second-stage payload. Numerous URLs were extracted, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm used for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://mtsskzy.com/userfiles/file/4417046803.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1f8f0d3d4a1880eb0aa0be0c3b6ae07e/20630457501.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/24324826124.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/10105583915.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/74277307655.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/wuvaxufimifa.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/68989098752.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/53269422502.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/japunalulojoruragiwobuw.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/94788410484.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/507473644.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/86100422061.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/witebulezovadafekafuw.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16148984dba694---88253322976.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/73046273539.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/1121399369.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614d12464db62---6808590594.pdfIn PDF document text
    • http://christopherdallo.com/file/domisutapugufofejono.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/14204265692.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/13104622557.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/72822927667.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/26380128039.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/tozesodiwoja.pdfIn PDF document text
    • http://bamila.vn/luutru/files/4024745811.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/sogedixowebuforolulisata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android_home+environment+variable+windowsPDF link annotation
    • 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_off0000c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 16252 bytes
SHA-256: fa58a1515eaaa63bdc750109af9d32330ccbf5dc1af0f7e378b6e26191db58c8
font_02_sfnt_off000108ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 10816 bytes
SHA-256: 026c48cb5dc6441f61ead8bfab5b4093fcb9309742fa7e574a33cc5b005c220b