Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab6798e340bfa2b…

MALICIOUS

PDF

119.7 KB Created: 2021-06-28 04:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bcc9ab7ba213334a0fe82c19d68f3325 SHA-1: ab4412f6da28954e53f50960e75d03a6521723c5 SHA-256: 6ab6798e340bfa2b876e0cfc41f5938ccb9f01a16d1e7eebe75dbbba672e4dfc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, which are likely used to distribute phishing content or further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f407cbb71a19f468f0e8bf31b3b99b81/ripaguxibu.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093e0f25e125---63821654983.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e2e35762a56c88d330ec2af02c4eafce/pivonumoka.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/woxudug.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/rejelijurigebelulub.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b85d4d6abe---desoje.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/bexivud.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/68889738584.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/wamugafumexa.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd7ea620da---1147782903.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c744b533dff---46649617756.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/83588460950.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9241df4f368a71f7c41e03852d184498/saradedimejoxabul.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a9945833e2b---50235844439.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087f6d33fc20---nokarodinivegisuderadu.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/kir7b80aju6gv8im5ef12cm3k0/48999358243.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bf6e121d57762ade51aee6ba843709ac/lemuruno.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/munola.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086b15772e14---jerowir.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/22012d9fec2fa87862852b8b65283c42/jexipusufobufo.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/93821417717.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608a24c691ea8---12113287887.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/cb756d78d11376a85915e4e9f747a7c0/wovaxonuwezabu.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/gowesirem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rate+equation+of+first+order+reactionPDF 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_off00016e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E01 18960 bytes
SHA-256: bba737e878efba35561c4dcb7611e5affa97f61cfa1a166799b833c69bdab78f
font_01_sfnt_off0001a081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B898 10716 bytes
SHA-256: 0da6c3fcff00b78aa78a9f66d453b7f3bf5feea4bc742bc2ca257d72183a09bd

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