Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a40569d2f96de9…

MALICIOUS

PDF

93.2 KB Created: 2021-07-25 23:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f99ac88a79955c73ccfdc54fdc096986 SHA-1: 9597b5ca41e7dba1440a53cf274a50fe87c7324d SHA-256: b8a40569d2f96de9b5fe941c91c04174919d624e3132e043941b42f48e06592f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to manipulate search results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 6

  • 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://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/dd42fb14727a5e1cdb63f3a59a97e1fb/resuzowuj.pdf In PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca21f39c72---31639365939.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ee1f524616267d2436fcfe937d44f19a/nigibazimosipe.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b5883fcee49bd0c1b0214cdf9bfc9365/xanazezor.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7d1b0d4317eab537eb30c9b4b8147102/wojawediruforagixejik.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf21f760e88---14936799720.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4a621e01---39648201559.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/98610663147.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080504f0333b---49306599395.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/1850236661.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3a2295d1---walorotiganaruzavona.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dddaf3c379---92055400435.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74d8ea6da---burizolejepel.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/temoloxufol.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/xeruwabifajilutufofaruv.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/bih2eidsi7j8kfi9q1atun3ha3/85127978998.pdfIn PDF document text
    • http://7onseventh.org/clients/868256/File/34051208096.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf5dd075f---86309716889.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/8f87298dd9830ad7f9dd2295ef35908a/jezalakozedid.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/padovuxugoga.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/46639068206.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/80244961709.pdfIn PDF document text
    • https://iword.de/userfiles/file/sutaxupom.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b851e396040---66518107836.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/pavadufazimuz.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/51406775575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ncoer+support+form+achieves+major+performance+objectivesPDF 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_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 17300 bytes
SHA-256: 715638a8f6e41837eb9bbf66bd14e8f3e7cdb2728cce213bfefd5ce2879e5382
font_01_sfnt_off0001334b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B62 11112 bytes
SHA-256: f33074a93fd28ac33deb1359908a826849c9518b1ea3a0063acd282c47c7255e