Malicious PDF — malware analysis report

Static analysis result for SHA-256 e657356a57109e36…

MALICIOUS

PDF

84.7 KB Created: 2021-07-20 20:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4a15892a18b15a8f76fb8da39318a4f8 SHA-1: f8b21a62c6966e6c6c1db70fcb8843d8cb5070f2 SHA-256: e657356a57109e36d552393324dfbb5325449cb68a971f0973ba0522d471995f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential tracking/phishing nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd1c4e74f---jimatimoraxulatag.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/e8ira3gb0fhsig3bgplpp6o6v3/basub.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f8a1aa93---dovulevowujiluvazanuzi.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/razowipelogeparukitalega.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/7u301a10p2mjhlb90tbirbd4u0/93374157942.pdfIn PDF document text
    • https://tessuno.com/upload/files/60e78f4a4e693.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0cc85dc0e---xutozefowezavupozelegevuj.pdfIn PDF document text
    • http://live-net.it/file/57113835389.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/vibunabizewesavapede.pdfIn PDF document text
    • http://3sdent.com/upload/files/virewibokasepawagonabe.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/pavupi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757916a4189---ruvibudufanavafakafezanig.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/03a8712f43f1dd40c6122ea1279421a5/xejidurunofepisozonifoda.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/njmrsvt0qru0babi2e42tcnenn/nidobadipubozevosela.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/633d30270e2a68aac798e3ccc6235535/fazidorevirumafip.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/73552229290.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30e80c48d---babupunepajozatotofasete.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/s1cgtnl5u7omjns0laccmba8ej/pepigezalesiguv.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/5559275150.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tretsf5peoe3d80fja715ht695/genopidawunenito.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/nodosuzed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=synonyms+for+business+development+managerPDF 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_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 16936 bytes
SHA-256: 6f115b1dbe97493443dd60e9aca0d2f63d367a0be0f6b8271746d2aca5fc4e70
font_02_sfnt_off00012b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3E 11336 bytes
SHA-256: 627df45b37ed39e0f64859b03a300588b9ee091826c9d2944cb2ad0561fd5ea9

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