Malicious PDF — malware analysis report

Static analysis result for SHA-256 b294808ddc84353a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 15:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35812b78c3d22f56931b643e5adbfe6e SHA-1: 357108a33c94a434e30564eb77ffb9cedf58edb9 SHA-256: b294808ddc84353ae9a477f75d425ce066bf51c57c3db554936c58ebcf0f76ee
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing sites, aligning with the 'Pdf.Phishing.Trojan' detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161101f322f11d---tunolok.pdf In PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/eed730e7a49d9b95d48ff5c2b2b79490/ledakugujokibukoru.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/maromuvazajetiseze.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a75a430b322---jegewezakusubemekalikaxo.pdfIn PDF document text
    • https://maviet.vn/upload/files/tulowat.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/folulawa.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9ebc1a1aa---2772131429.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c659204be---79307835591.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/disesizaxe.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/bujefirajetugapip.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161269f134bb23---82644316033.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/fifesirajixovikegi.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/tatikixadovavumaz.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/088207ea7259ec4dff7ad5049c67690e/zevotugudisirekomabod.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/xajebudagekiti.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/r70ijmh4mo4rbpuak8nqr013pn/winonezaxukoxinibevaner.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b7271a46e0cedc83e76359e1c36cab43/17223627988.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/63329737517.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127da16ad4ff---nodaxu.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/1823148212.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dajekibagajipixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hillsborough+county+school+calendar+2017-18+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02E 11828 bytes
SHA-256: 0198351deb3a3ddd98b75754e2dcd6b27d91b383837458ec8e741196014ab9bf
font_01_sfnt_off0000ec36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 19120 bytes
SHA-256: 28a10f774dc8ca3c0c18d0c913a108ed8f1d0f2821dcdd546e7e9e13b8ce4f5b

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