Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca194a9c3d46b4c…

MALICIOUS

PDF

84.2 KB Created: 2021-07-24 15:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1981420874245e4e48df1ed362021efe SHA-1: 50055ca5d68155a3b46d33c2f952cfddc76c16e3 SHA-256: fca194a9c3d46b4c4036f31eacd297981f02d0abec7b68fe7ae3c3659520526f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier and exhibits characteristics of brand-impersonation credential phishing, specifically impersonating Amazon. The document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, with the primary call-to-action link not matching the impersonated brand. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to a malicious site for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=esl+sentence+structure+worksheets.
  • 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://m-co.de/wp-content/plugins/super-forms/uploads/php/files/2kr0di0l32aqaihomv59no865a/muzilifewaner.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0770423d---wevavudotunegomajexef.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/601g7j8k60747ks4bqh8qfot0a/putagik.pdfIn PDF document text
    • http://short-story.ru/upload/file/tomawujetage.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/41278661466.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210603162754.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/45933109509.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/56216309609.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/117cf011b415bb3a770c5de0384f6fcd/32550568375.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/36446856661.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078768d3480e---dimawelevu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/5e60b6c4eef8fc1cc6096ba1a807285c/77574304057.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/e4k37h3avji42n33doahbsbvc1/61657908321.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/famekaj.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/26370546929.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799b45e0b07---85710520318.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa6eb665b---68163875359.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160908f35b34f7---lexilebakekunibop.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/648ca0615def82a2ba8e2d0b8225b528/woniladugatedenupavibamu.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6b1965a00670351831f3990a058a441e/rijepijofavopuvowebivabum.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/snndjftpss04f61tetb1don687/81447163840.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49b958c3d3---bonoxuxisatiwejavojopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=esl+sentence+structure+worksheetsPDF 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_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 10332 bytes
SHA-256: a63c96586f901e866c3a812b3dae2462e0f0f3ad7af240b301beca41ad4b700e
font_01_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 16748 bytes
SHA-256: e816101d34b36ac2051e735f37f5feb78e9207ef042409f02620ef5f9f23d25f
font_02_sfnt_off00012aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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