Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d010864d2e79c9…

MALICIOUS

PDF

85.0 KB Created: 2021-07-02 04:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea470afab911b377b20bbcf6c515fceb SHA-1: 027c2396bc8224cd02b662947f8137a3a93611c8 SHA-256: 83d010864d2e79c9194be610b3c9f9d20b3f06d1264c599e6151a0c8bf7919f9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the links likely serving as the primary attack vector. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082a229925a5---71905648586.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9624af92f269d2d77a524b92203d338a/78017538522.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097673010cb3---nudozujodin.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bidasadamoladimin.pdf
    • http://soldearenales.com/galeria/files/40656458712.pdf
    • https://bloomland.com/sites/bloomland.com/files/95260139751.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5cd484e31c114707eb80f895c691eb58/wotosebifo.pdf
    • https://aviatroglo.fr/IMG/file/dufodipemojuvakelipi.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68d983bfa2---57939828921.pdf
    • http://bbfederico2.net/userfiles/file/nonuvipoxebugifewitex.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c10a1edc00---lesowenifuweti.pdf
    • http://eksan-ltd.com/userfiles/file/16188741995.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/nbecdctpc39u18u2agn5f5a5sr/posozeposuwokejo.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d377275e6---65195761609.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd37f74456---49948233893.pdf
    • http://www.serenissimaservizi.com//files/fuxatusen.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b261c9f0614---60173024874.pdf
    • http://ahkjt.com/upfile/file/vujopun.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081f650c3d79---tadamedoluxofudivolol.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44dbc1eebd---88413774573.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/roponarojajilirezap.pdf
    • http://twxcd.com/img-aim/files/kiwobodediperu.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d852efcb8b0---nixusiki.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d64acf571---govaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=simple+relational+database+example
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e914.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 16792 bytes
font_01_sfnt_off0001012b.bin
f1712bc836f21bd5494d177cae9b3d10d0d9f5f13b1bd418092be73050327719
pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 10868 bytes
font_02_sfnt_off000119f5.bin
8ee1366a72cf40154917472e980ba60f06d3da7769e25105204b3a895f6e196d
pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 17060 bytes