Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47b2d3381528332…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 17:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b6d51ae752eca148fbc075dd2392530d SHA-1: e1a4cf0e06c57efb7c3d7067154288d4b2d3536a SHA-256: d47b2d33815283323e807536c39a2c21d7f2fb897a12e66ea69d07c6ea7e2424
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate it's part of a link farm strategy. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613663317a899---16591879036.pdf In PDF document text
    • https://worldpigment.com/image/upload/File/59840350225.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/16815158674.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/46353258999.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/83668406495.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/95397343914.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/wurufazusu.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/9071874185.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/kubobo.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/31001395413.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/83341859575.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16131b25de01ec---64294048559.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/k2vivlg1djhvm24gt71c96lub3/81839616930.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/50234244349.pdfIn PDF document text
    • https://rajakedua.com/contents/files/bugixolut.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/071835076554.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/nobepepasedow.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/11584821823.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/8531314494.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/bixiwamifolupev.pdfIn PDF document text
    • https://marosme.ro/hirek/file/16561463583.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/miradekuwisideveveduwuvo.pdfIn PDF document text
    • http://laserinnsbruck.com/static/26286373575.pdfIn PDF document text
    • https://mmszke.hu/files/file/bejeru.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/palagaparajuzomuxebutun.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/dexawipofexitugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+best+offer+watch+online+freePDF 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_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 18168 bytes
SHA-256: 7556b2e6c81a2feef176e143f4dbbcde6a4a86b571557e55ac556bea8a2fb593
font_01_sfnt_off000112a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABD 10620 bytes
SHA-256: 4e67f9763283e67d1e3b178d458e3404e0e407b4d6ec8a1c6a902d1060ff33b6

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