Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7d41d5effeeb38…

MALICIOUS

PDF

105.2 KB Created: 2021-06-25 17:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc76e0d8a2ab3eb604a7db5c4b2281fe SHA-1: ac30d595c9b0d50b8b5ded3b242fb59b059d32d4 SHA-256: ea7d41d5effeeb388fc55e58d7d9a2589d56c223e982a193a26a71a78444bb4a
164 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of a 'download button' heuristic further supports the lure aspect of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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.
  • 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://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4909ab6511---petizujidumanudojigemaxa.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77ff28ae5---79313564631.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/rjn8oee2cq37442r8e3bdet1mm/paneganaduv.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b998d47bbea---70506434007.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7ae5edda825e152a6a794b54c1e7b3bf/zimorudoxopogid.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074746d1979a---20311484032.pdf
    • http://zigzagontwerp.nl/sites/default/files/file/32632820775.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a791ed5ca---58634022435.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a50933e925ae8083be35a35ba69ebe91/14823955112.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/ralemudo.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10871708974.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/808f997d71a4bb306ebc23b4930d5650/11998465366.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5715f1cbce---59128948290.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/03aba85bf23524c13c8fb1e2543fdc22/jurixemigamixefiwobalaz.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6dcc4b3ce---jajadog.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160abb2777b3bd---roxadowasurinepajuxu.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/54013d3da228d921d2a0930dd400d46e/gusab.pdf
    • http://naplesredeals.com/userfiles/files/jajoxuw.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/an82tu97ps7cbai4bmd40v5hn6/wawedulobelataranaluf.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/729a9bdd9a2e98f94b877b7a621e4e29/moxijutavuxiwasef.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd414ca04d---67304408310.pdf
    • http://messtores.ca/fck_user_files/file/ritujojepo.pdf
    • http://writtenmail.com/upload_images/file/tiwutenivedokazona.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=class+10+science+chapter+2+all+question+answer
    • 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_off00011f59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F59 16792 bytes
font_01_sfnt_off00013770.bin
a4b9400a0b25f8cb1b9d03c84522d883333926f453fc0f1607dbe011e22a80ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13770 11128 bytes
font_02_sfnt_off00015178.bin
37d88f94ae547ab828e38af12c21f7df8137b1f0ef758ff606b52a513f317f97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15178 17984 bytes
font_03_sfnt_off00017ffd.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17FFD 16092 bytes

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