Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d82b8b6de90ae6e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-04 20:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9bada1e85d8215b9ec9215f111e02bae SHA-1: b710c7342939404debbe48b29ca522e5f92f93a7 SHA-256: 2d82b8b6de90ae6e50f506bb6bd3619e0e901a1b3f373f2a439b1198e1e6347c
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to lure users to phishing sites or download further malware. The presence of multiple links on potentially compromised CMS uploads indicates a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

Heuristics 5

  • 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
  • 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.jobsincrete.gr/images/_user_na/file/dukal.pdf In PDF document text
    • http://joyear.com/ckfinder/userfiles/files/silasuku.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/laxefumejefopi.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/731051eb8fdc215cb8aacf7f7f084071/66271717287.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f4cfd9e6d---deguwabetarosudak.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/86269862427.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/50169083481.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/32722303942.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/49050820933.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/60610632231.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/t29sksgnkvmbgpq4vu71uq25eq/nasogowit.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/xinadomifokexaxariso.pdfIn PDF document text
    • http://alkanboya.com/files/file///pokejofozebixatekajetofu.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210620_42912192B787FF13.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/wixibed.pdfIn PDF document text
    • http://ipublicity.cz/data/file/bapuvugamegikebuvo.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5d9a64460ca3ab1fab0f48a8dfe5ea06/loselagokit.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-2/20210902020419958286.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/5188651293.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210717213622_kwj8kf.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3c8bd241c7c7ee99d0400f3a78da11e6/75523807972.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/83461692326.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/6f7c471b9d1ac0f4daaac208998523a3/sazegadagexaxiweja.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fda831979a---jirilimimo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161025bc8f2a57---lasametokal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=participle+phrase+worksheetPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B0 10548 bytes
SHA-256: c12780eaffcc7c366dc78d75905a142eca06dc42067351b8c6e478583551825d
font_01_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 15852 bytes
SHA-256: e8d665a1270233c752da6e2c60525a795a754b2c8de28727f8389de87f8163b9