Malicious PDF — malware analysis report

Static analysis result for SHA-256 144f583a6a2e4b18…

MALICIOUS

PDF

85.0 KB Created: 2021-06-26 05:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c618f8daa4031aa3cf96256fe0ce0d9e SHA-1: a78bc7056f8c6b732b3568ab4a1adb5b243a025c SHA-256: 144f583a6a2e4b18eba9a67ac9cc950a719692e939077182fbf71ba2053a8a7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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 http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5daaecc441dca9568a747dccd1b01107/dozuzo.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57e8d0d307---26027467204.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d7d72776754dfc0c32adfe9f2864a2e0/rodixaxa.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/tusavidezuwegezuwigew.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b7f7321d6---vawanavanonuvax.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98114491034.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160766d36084a2---xoxivuwagexuvudowuk.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5d099bad4d17dcb7d198c20df49633cf/veloravefikufi.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe60e52844---89184338582.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f9f705ffd---koxivasopafi.pdf
    • http://blpest.com/UserFiles/file/61692306252.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820e9e4a8be---mizajanedukol.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081639616eb0---97690802549.pdf
    • http://pospatrans.cz/UserFiles/File/risovazosinaw.pdf
    • http://aokisuper.com/ckfinder/userfiles/files/mujel.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d02e7fc7c3c69266630816e7729fb365/40441976947.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd04aa528---nigagivemofiraven.pdf
    • http://djpress.pl/Image/files/44303812267.pdf
    • http://jucal.es/images/file/13150874738.pdf
    • http://blevy.com/ckfinder/userfiles/files/fonuwefet.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/60e0f228359a9c5c544788ee91f2aaa2/26719985936.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=5+examples+of+anaerobic+exercise
    • 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_off0000e871.bin
73534ae0f366d7ab411843a58d42ce8201891f8d783dcb6ba90a4f3fb18804e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 10820 bytes
font_01_sfnt_off0001011b.bin
bed56fd6f67c79bc6a4a40a04d5030829a3eb6da4118b728c6c6263ff6c57008
pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 16824 bytes
font_02_sfnt_off00012cf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF7 16792 bytes