Malicious PDF — malware analysis report

Static analysis result for SHA-256 83040070c0e2c181…

MALICIOUS

PDF

99.8 KB Created: 2021-06-27 08:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3705679ca515656e9667de8291bf810f SHA-1: d1cae55341cb5819c41f91892f14f68ee74d4fbf SHA-256: 83040070c0e2c181d4ae1d8ab3813c1e3d3233372d5cdc14558b68abe57ccd98
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links are characteristic of a lure designed to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2e7b1cc8a---jadobuvusiwifigatuwijik.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/4to9o8qpne2gqluv3nfgd6rmav/79562744686.pdf
    • https://takipcisec.com/calisma2/files/uploads/tazofutinokalibidonogo.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gl9ggvoqaft07lp1o9fm0nfkh6/96199932622.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/cgudhbdedmk7qmmupil4soi5o5/72552238121.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/555de298bb3788c3f8a71a4dd4754082/75792864796.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2a52fb8a15313688deb00f193e7466ff/66730083944.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f25b20df98---14758298759.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4c2472efd---lemufe.pdf
    • https://tonwen.org/userfiles/file/nokemosomefesoreb.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5bfc1505---doboxuzado.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607f873fe489e---kirozufujatikumivu.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/4ku17k1n4etj8ta56cvo55ds0m/43662052468.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ugfgk87d3td7ktdo12pf3hsot0/rimuwakovosa.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/941g9mr619325vpr0afou421kv/38574407480.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/88689f529f01add33d1398d2acccfc6d/poseselogawu.pdf
    • http://sacoorhealth.pt/site/upload/file/woxumagogajagaliduvupi.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/1423f81c1ff902351e0d655f3f24a8d2/xaromamirimolusor.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d2e8a42bd---tadelufixitazenoroxi.pdf
    • http://kahounova.cz/userfiles/file/samonipisuvurawiwabowo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=house+flipper+game+price
    • 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
font_00_sfnt_off0001008f.bin
06f2f5b710f9c688ebc11252e7548584f24a8226a69b6271e0e83f16adc266c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 22480 bytes
font_01_sfnt_off00013927.bin
1254e677851d45c6c72a6a7058ff3b11fa14c8a4ca149a35243e3bb46c089e13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13927 17268 bytes
font_02_sfnt_off0001512d.bin
5a3cf133a589c366a7f82588da0ec156ff5239f62e62f174c240bee5ed562166		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1512D 10712 bytes
font_03_sfnt_off000169cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169CC 16792 bytes

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