Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e90f7d39e77f57…

MALICIOUS

PDF

69.0 KB Created: 2021-09-16 00:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76c3ed9b61f6fea91822797ae6d4e2ee SHA-1: 65af1d65e520f60836e1397cb5bd71f09c33d583 SHA-256: 15e90f7d39e77f57d25e7d448e8bc78511e53259df85b70de43af30831b84f49
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document's structure and link farm indicate a likely phishing campaign aiming to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://allytemp.ru/uplcv?utm_term=we+2014+apk+download+for+android
    • http://finpacecuador.com/userfiles/file/51856063233.pdf
    • https://markmont.eu/editor_uploads/system/files/lowolezikomilenik.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd77933346---veraxexifuxakote.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/23fa28af3d9039714121ee03b0cd93d2/90134446940.pdf
    • https://vvpta-irvine.org/userfiles/file/bakabudi.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210910174849.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/49952991715.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131652f2b1e8---renifapagikukuvanakidev.pdf
    • http://omni-links.com/images/blog/file/40265001399.pdf
    • http://misosmile.com/upload/editor/files/52211481579.pdf
    • http://oikoscoccatoarchitettura.com/userfiles/files/nifodezevokagewerale.pdf
    • http://tomei4x4.jp/js/upload/files/kediwifumanuxudupazumu.pdf
    • http://www.andreapondika.cz/file/76403898799.pdf
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/wuvosulok.pdf
    • https://profix.fr/ckfinder/userfiles/files/10296254306.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48e6cc869---18386624796.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/5058251096.pdf
    • http://artospace.com/pics/file/75616722256.pdf
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/40846861160.pdf
    • https://m-astar.com/UserFiles/files/43026325946.pdf
    • http://zkojicin.cz/userfiles/file/57269188415.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376532ef98d---nusamilipewisoxalujuf.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/74951508571.pdf
    • http://ahdjcm.com/upload/files/bufebukegitezagam.pdf
    • http://gr-chem.com/upload/files/tifesolofezodumuja.pdf
    • http://oldmotorsclub.com/files/file/9715791612.pdf
    • https://invest.pl/userfiles/file/tafofojafuvujemikatesi.pdf
    • 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_off0000b286.bin
443b4143374e538dabcd4466a66962680b44079ed7c7dfbe49980312530c25e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB286 14060 bytes
font_01_sfnt_off0000d58a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 16792 bytes
font_02_sfnt_off0000eda1.bin
fb83ddcb388a9864169fcce4188153f6c76ac8f10ce174b82f52751d10d24a61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 10768 bytes

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