Malicious PDF — malware analysis report

Static analysis result for SHA-256 49336103ca799fc1…

MALICIOUS

PDF

90.6 KB Created: 2021-07-25 08:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0ced02dbe27583982c7d0822babceb9 SHA-1: cb43e8da9ed343f1c8ca3659f76698a07700b4c1 SHA-256: 49336103ca799fc13d18476cfa85aa40d6de4d35b93b8fd307104e5341a27c65
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely serve as a distribution mechanism for phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://e2ingenieros.com/ckfinder/userfiles/files/wesuvoranod.pdf In PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/oag1vieeb8an4festdrllo8i66/bedurisa.pdfIn PDF document text
    • http://kunbot.com/upload/files/89042247237.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/memikeza.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/86592393341.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9376198ed50bdbe8e7e04841d59e0ac1/37700215564.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f97a458104d176c34f3378336d1a4d54/jasosugir.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d983a73f5f57f9736da757df57097832/vokavomepupu.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5ub5e7r5ml92c1vs88a50dot13/zadogaduxexubepojegas.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/feweduw.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/zabubidapipijekowukenog.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/lusogu.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/57447811416.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb00128d3b9---75317773237.pdfIn PDF document text
    • http://sun-eko.eu/files/file/78509923509.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb75531e59---dutobodozomifesi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2b6aeb31b3683e8c8c11888fb4e446b4/49917628367.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/manoxiz.pdfIn PDF document text
    • https://actorconseil.com/files/file/71484125092.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vikad.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b9a1dfaff---27333959796.pdfIn PDF document text
    • http://caffedisanto.it/file/dedikubidexeze.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/68108822178.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2d59e42889979fe9f2be00244f38dc11/rofuguruketizijefagiwud.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781fd2ac72b---25203833613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=harley+davidson+accessories+catalogue+2021PDF 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_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001144e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144E 17212 bytes
SHA-256: 5d013cd41a5f414571b03efad5aec1a865cbf3d6542f2e14fe3fae81f4d34af6
font_02_sfnt_off00014188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14188 11108 bytes
SHA-256: 1d98525be0103a6203d1112ed6dd2235da751e81e739fc5ab5450f3b6b5022db