Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7a09c2e8cea203…

MALICIOUS

PDF

133.0 KB Created: 2021-06-26 08:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8be35745b12a57d493c811fbf8a14ef9 SHA-1: 5835dde7bfdd14df2f85819ee4029f7fa61c8901 SHA-256: ea7a09c2e8cea2032710031537d3d2ef4018c2887e6813bf786482d0bc71fb4a
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier. Static analysis revealed it functions as a link farm, containing numerous external URIs pointing to compromised websites. These links are likely intended to lure users to malicious sites for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d185373cc4f---suvuxopufir.pdf In PDF document text
    • http://wskinbody.com/data/boardData/files/kunitezot.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/j4tpnft2esapt2vn459264bf1c/dorosijolokelufifejiwub.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7bb452e5b---62366093586.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rd36bfl9rkki54q0c55tu3o7br/wixonosanasan.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acbc7b1fafc---vojafiviku.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/93570706789.pdfIn PDF document text
    • https://songhong.info/userfiles/file/61196048200.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfumsh10k5l34hmd5hmikefsfl/venelotejarowabelesit.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0cb25fc9f---bawosaselaper.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c6159c83dc3---89696275315.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/koj123tdt70rcnjgntnl2fm7tu/jixibepojagaderamimuv.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/jizutav.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/l3st56g8mipf98d365dcd1co8h/runijazelu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a61f324cc79---97251639050.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dm9cl22nrh8s7voki0837l3s92/kiganot.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/90478526504.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210511053135745646368.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608782405f15e---66857634506.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3f84c71c---83468296400.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/34437628665.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/39928960534.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d6fb36f2be59c6cf936d2b1e56a67189/paxenalidiwelenobi.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/889a964770001098bc0bc2539941af9c/19300050651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=feature+guide+for+primary+spelling+inventoryPDF 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_off0001a4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD16 11100 bytes
SHA-256: 0c01a6a7a1a1ecb2b84152964e1195c3f958ffef2a4acc338ec684a28ed8e18c
font_02_sfnt_off0001d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6C4 18184 bytes
SHA-256: f3a6dcd1d7aedbb3db907f90c12de2d7c2d6bccfbe788b0856d31ce4ef8edfa8