Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b2d5208b45d44c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 17:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e88085ee38d7749719062c811a6e00d SHA-1: 4ec87d709f26d03ecf9635a20fe3f1300253ce55 SHA-256: c2b2d5208b45d44c567627af32e88a7b16db58d23692022364a8e4c4fda5d30c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites, likely intended to trick users into downloading further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF link farm heuristics supports this. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63b2f2f60---21556329588.pdf In PDF document text
    • http://onellenorzes.com/uploads/files/pawesoviwurovimasuxukabum.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/benifo.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/98311950588.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/sutonapefebuzipusomuf.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ieqb4uqnf17etatrecbb4sab1t/ruwigizugefuruval.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607723e6aae48---24872294768.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/xutes.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/97qpss8g9u3pjv6t0sl9330h83/85520254300.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/80163893993.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suzuxisitarudanusiwet.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/70592683352.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a05b48d901a---9962482224.pdfIn PDF document text
    • http://debden.org/userfiles/file/kajusogoteromafo.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/64939048531.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/kadurexatinibokumi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a481f80a094---ludijilafazovunolot.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ns0cem0difrc4lun39jg5tseu5/sudewefosexovopexej.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f5445e740c40ba24e2af19bb9baaf56d/80916654729.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/77280381646.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79b0fa556d7e09e9ef450b8829f77101/jusefewubigopusoj.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/75943770563.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/191ab50ba378ab5355d93b908e6b075c/viwedalazavudobasak.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/dazomibaziji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+world+of+the+married+drakorindoPDF 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_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 10592 bytes
SHA-256: 0e02a749f11ae6425ff7bc020d6d18a9d185b5ce0eb2a42124b891b181f4fd67
font_02_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 18360 bytes
SHA-256: 72b7278ca31ea2f35a381b21ed381748788f19fc0319970c9d8d88a570d1eb8b