Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cfa0e6ae6c6f38…

MALICIOUS

PDF

74.2 KB Created: 2021-07-01 12:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cd6a1fe3faf717b69a03ee6d0c84346 SHA-1: 7d6d597e3c6c3979534f4e16708d9a9ca3eef69e SHA-256: 66cfa0e6ae6c6f389c1b06b8703bba95e5ccc7377da476bd0d6260aa7410f0a0
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, many hosted on WordPress sites with form plugins, reinforce this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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.
  • 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.biotanika.pl/upload/file/80543657380.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2244671c1---bedudarakevaburajugapo.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/hatqgp2cpaklgb3imgjikjtrl0/rekerafokidasax.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7g25j46ue7ddtdpl0cv4t0da3q/biwijasaxamaw.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dcb564bb0---62323299683.pdf
    • https://hse.tw/upload/file/waxitowisufe.pdf
    • http://alexlunacoach.com/img/editor/file/12028955782.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/f1khao0gko9gbe5l10k3luhqvp/boxok.pdf
    • http://hornets88.com/clients/56662/File/labenetofaleziwo.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afcecc2e73---bebijexezuzonoxegelupunis.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/4iu3uho6gviecacfov017af2k7/vanirog.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430131301990296.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a488741250cae88f5c05ac678b19a74f/penaxu.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094acbcacdfb---tizages.pdf
    • http://ithaca1962.com/clients/41687/File/tilunipiwikuz.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bb978b5b993---zalibapoja.pdf
    • http://aeronautike.com/userfiles/file/lagezuselapatipaw.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608be9181dffe---80236088885.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/0f91463bf1b558f5bde76e50512966f9/pesevovizanorulafunesa.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6301c2daa---gemaxinesi.pdf
    • http://csc-0898.com/userfiles/file/20210625152455_237grv.pdf
    • https://embassyinvietnam.com/webroot/img/files/revidizawejiwumaxugol.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/cc5e44bf8955e23274f327ef34131e55/46327624749.pdf
    • https://corghialberti.it/file/37306691095.pdf
    • http://dnepropress.net/files/file/sinugigetefinijis.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/mnudi3f7jf0hc6aiu573eudc7t/34561179698.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb0bcc353e---pawazojufaruririvabimevej.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=c%23+rss+feed
    • 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_off0000c5e1.bin
fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E1 9104 bytes
font_01_sfnt_off0000d8ae.bin
2216fe16295699e2d024f12c3c7b47263f1032e75e8e8af1f3e1aa928c640a4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 16472 bytes
font_02_sfnt_off000103bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 16792 bytes

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