Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb52341e234493e…

MALICIOUS

PDF

92.7 KB Created: 2021-09-13 06:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3dbe003f2714defda153020fac477bac SHA-1: ee9ca6f7513ec10d324783066b943d90a832fd3d SHA-256: adb52341e234493e7a22741502c9c3aa8739e273b6f4e2f76f9d1c852eab4f78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings point to a deliberate attempt to host malicious content on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://synerhu.ru/uplcv?utm_term=interesting+words+starting+with+b PDF link annotation
    • http://goldia.cz/data/file/wuralulakorekejifev.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/88137514442.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/pofukoluneg.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/matifepoloxig.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///mokepamolofar.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/nogijirezok.pdfIn PDF document text
    • http://fygl.net/uploads/file/0806321567.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/91147941730.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161395426d6e72---velorawajunokobekepugiz.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/32255472918.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/74545512882.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/janukomugaxim.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/wamopenulewogiwebufepugad.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/30301549335.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/65339169956.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/gaginutawegubuwowatiw.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/48696845510.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/78390303279.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/85698831653.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/fuxokow.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db29d43d7a37c21a0d913c68c1cb526b/kawuli.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/puvazi.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/fesunivabewunimobu.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/92571598485.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/gorodusaxogiledar.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed697bda2---63135286822.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/daritenapujisufona.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_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 18900 bytes
SHA-256: ea8cdaea4007ead102a68636c08468f0652458e89b4822032d6595fc976cb876
font_02_sfnt_off00014c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C94 10660 bytes
SHA-256: 3c70cdd7a60efec08365506c8d5785620e5c180ab17b43308920918610cd3701