Malicious PDF — malware analysis report

Static analysis result for SHA-256 0381c6a551769205…

MALICIOUS

PDF

81.7 KB Created: 2021-07-02 05:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0ae288666f1dc269dc57bec6bb91373 SHA-1: 0a71aa466b4da2e31204c5971c1a182cc00160a5 SHA-256: 0381c6a5517692057648039186869cda574acc8aec90061890198f6497fa436e
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • 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.
  • 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://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e26db4a17f50cd60c70fd7dc93e5f7f8/99522145825.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eb005dad2---godegipegidufogik.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/32383883427.pdf
    • http://podiummoda.ru/userfiles/file/kuxovozevagixu.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160797dbd9c5e0---kovulogilixe.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/paxuxe.pdf
    • https://f27szerviz.hu/upload/files/kujefopuwowubakofomu.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/patekupobadi.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb680d691---rexerusazodorome.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2135913c25---nufixavip.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/r6880kdljul67h7i84f024susb/62736756067.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1abbebd1918020794334d928a21625aa/87535066833.pdf
    • http://vogiantinhmach.com/media/ftp/file/40037880987.pdf
    • https://satuldelut.ro/ckfinder/userfiles/files/9705007643.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606e45fb075fd---94516841516.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dccc84a579---zidaditabulozomurujidade.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/6al5shm18rgo8ns7jfr6pg01f8/19738432181.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b43f8cba2ab---60981137429.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0d6929f15900d35cea66685f1383e630/lirasetit.pdf
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/50202217304.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160851acd31b38---rejodo.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/nno03n1mfnn5thqeo448sde1od/xenoxewesam.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/79352c18ef353447560403fbe4f400cc/mowasizawefi.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5a2bcac45---55315049766.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2177c9ef890fc1b448d0090c3111959e/17382364842.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=use+of+cramer%27s+rule
    • 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_off0000c6e1.bin
325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E1 16084 bytes
font_01_sfnt_off0000dc0e.bin
939043d8331372be56cd7531441d5a6705e82cd96edc3c81eff9618cd26ae090		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0E 10344 bytes
font_02_sfnt_off0000f383.bin
54aed2d766ffd7d73539399a7475b49c941f026e401166efb20e518593b11702		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 17312 bytes
font_03_sfnt_off000120e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120E0 16792 bytes

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