Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e4071056d8a344…

MALICIOUS

PDF

89.9 KB Created: 2021-07-01 16:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c417aae64ae1d7914e38c52f02b22603 SHA-1: 76abe8bc273647e9e9e304b251c8975dae6f027d SHA-256: b8e4071056d8a34442dbe9a8ca5ebb7ae8b8fa3a5246f257c4414d8fee8679de
164 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malware. The presence of a 'Download Now' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chnli.tw/CKEdit/upload/files/22072693075.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c258ba5bf8d---1568848235.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8aede8cf---76474755737.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/04epgd32jrl94d8hk2cfnecs79/xozol.pdf
    • http://baaningdoi.com/file_media/file_image/file/nizufo.pdf
    • http://www.cddfct.com/up_files/file/52649032757.pdf
    • http://traiteur-ribot.fr/userfiles/file/49615139514.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/7de48a1818119745d675a9f4ae890d1b/79215229054.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160800e962462b---zizene.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23e2de6b24---kaduzufekoluf.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/1k2shguggnqr1of6utamh6cpve/bajumisazatow.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082287436ebb---noxorijobazumutixisubupo.pdf
    • http://monkey-do.net/userfiles/file/surokilevivotodibosiluzo.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/54ea38df636a91a90da97a828dae646a/jebovepofa.pdf
    • http://lycee-elm.org/userfiles/file/vewawozewowen.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9ce91b60f---43630069372.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/rkj9erev22d729272asho8vnk3/fufopekitodufumazobifir.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7b6e8a5f93d7489a4eeafd984fb0a808/vabujikogajesuvudanun.pdf
    • https://istocdukkan.com/userfiles/files/56515481206.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c06646def30---50466746739.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/liveminijemuwopa.pdf
    • http://computergramm.com/userfiles/file/17966973206.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb3faabf6---sunokakomulewadovavanivig.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1650e7943c---pimefuvavuvamewitotudimul.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5acba6b5c---41358621384.pdf
    • http://renovator.cz/files/file/sekurosobasixelunigat.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=real+chess+3d+android
    • 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_off0000fb3d.bin
d59ec1e7cbbebc2e1739f190bddb8bc7ee9fa94505c56e7b87c51f730918d6d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 18032 bytes
font_01_sfnt_off00012a35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 16792 bytes
font_02_sfnt_off0001424c.bin
d7478debbde87f2138035bf6e8a76c88070ba1f0826d90cbaff4b1424179cd46
pdf-font-stream PDF embedded font (sfnt) at offset 0x1424C 10584 bytes