Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33db18b584eaba6…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 14:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50b0cfa84c6739f8f70317e73f83e735 SHA-1: d4f8d5daf84040edd0a56af34c2b805067702498 SHA-256: b33db18b584eaba62547abbeeb6558c3c285178ee42189814a2b760c91a43928
124 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable domains. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3165

Heuristics 5

  • 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
  • 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://dalnoboy.org/data/filestorage/upload/files/80788548997.pdf In PDF document text
    • http://archpiudue.com/userfiles/files/mapefuxigaf.pdfIn PDF document text
    • http://contextuae.com/resimler/files/75568798546.pdfIn PDF document text
    • http://ropesadventure.com/d/files/kibekajufadew.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143d022971e7---petufukenanovefovevup.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/73312226549.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109060427244011.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/luleribuwejilutitibabeki.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/50886731787.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161413d72b264d---wikakokoxuw.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/14416782659.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/gufafepojopunevevivakib.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/74472009592.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/manifogilufilumuzogoz.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/jafulovufun.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109011838378146.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33bc8f31f---1478230320.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/efr699qkqa09rbgg02e2i62ufj/78678500931.pdfIn PDF document text
    • http://chenruichem.com/upload/files/sijinokorufele.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/dikoxixitu.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/mitagirodetu.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/53658332698.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/31739405709.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/12035546190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=1+john+4+commentary+easy+englishPDF 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_off00010e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 19344 bytes
SHA-256: 48170a43b41553d987efc1d2d1525c964d002c1e63fd42842b91bd228b166a00
font_01_sfnt_off00014082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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