Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36e6773d7cea7f5…

MALICIOUS

PDF

145.3 KB Created: 2021-06-27 19:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16400a3a8b90508e4ee286d7e89d43a0 SHA-1: 133ffdbbf8eaf8beacc166088c2d260f1f73413e SHA-256: f36e6773d7cea7f5afe08f6c5b082f311ee9f0be0fc56588f039038082009fa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

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 https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/tr3ir2chal7fq1i2b0af9v1pba/53433307073.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/7e291748d74a702df5a8620985400b91/suvudukuziwazafebafu.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a1845e06e---29710048084.pdf
    • http://lltsg.com/uploadfile/file///2021061823132313.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee395042f2---gelapisoxeso.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f4956a809f26e48cdcb480daf2238fd4/gumojasuritewuvo.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c36e151a763---13498697851.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/fuxanikudaxajasovigunu.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2fc12dfcde2408bfa032a9722bedf4b3/38236731344.pdf
    • http://musicpark-live.de/userfiles/file/voweti.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52b547300---nabekepupi.pdf
    • http://tofuyatogo.com/uploads/files/93974976012.pdf
    • http://chromatographvials.com/d/files/73725125482.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wilemikelufo.pdf
    • http://school19-zav.ru/userfiles/file/bowugovazaxazotobaxelomax.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/65469a097525a59133010b5625c1f8eb/lurowixedaropizu.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d8d47d40---88194831469.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160708c3097093---58630118000.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c422fc5ffd9---satibuvolufemata.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d43b07a6742---97234652118.pdf
    • http://sattosushi.com/uploads/files/lesolemukalowi.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/42740580047.pdf
    • http://amon-syotengai.com/userfiles/file/gilanemuveri.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b257fc06abddfe6b3ec3d168b35a30a7/23407036491.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f3b5a239e2a17f4c312fe2c035086d59/92450526334.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=different+types+of+camels
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00021a5b.bin
e23ab467bd2a50370951c507ffcf1e0b630dc5fa9299ef65bfa929daf3cafccf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x21A5B 17644 bytes
font_00_sfnt_off0001b449.bin
ff77a108ae580839fee84ddb7e5528ac68d8f09c52d8fbf4783d5cc362f6298b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B449 21176 bytes
font_01_sfnt_off0001e97f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E97F 16792 bytes
font_02_sfnt_off00020196.bin
bf243ea222418f5c3498ff113ae6af1727efc19073e5655d5a90f0e8982c75cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20196 10756 bytes

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