Malicious PDF — malware analysis report

Static analysis result for SHA-256 5557cbc2c81d6c6c…

MALICIOUS

PDF

112.4 KB Created: 2021-10-07 02:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 71fbf1ff117e2919d00c216e2431b393 SHA-1: ea71613c3be0d09dd9ebb69edcc32c51effd08b9 SHA-256: 5557cbc2c81d6c6c26e3bae92be3b2e9c7855e2f614110c9aa0731b457d10346
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as a link farm. Multiple embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The file's structure and the nature of the linked domains strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6176

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://duepassidalcentro.it/userfiles/files/31096498371.pdf In PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/wagalisivopifolufifokixi.pdfIn PDF document text
    • http://erex.hu/upload/file/kugugadenevakubomawe.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1632116905768035048.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/mafafezuwazajibuno.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/wekinajotur.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/58908127699.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16132ab6a538b3---61101818287.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tadigoganumekojebokatu.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/97553076321.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/38532167934.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/zitakobatakofejid.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pagugapujutodapazo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161566665546ec---kazelibegitobe.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/lowiza.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/71493364828.pdfIn PDF document text
    • http://wmsone.com/eimages/file/garog.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/gutanewujopupikiki.pdfIn PDF document text
    • http://keitbg.com/images/files/45471215203.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/31691955302.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/96526337822.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/dusuretulem.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/relatatifap.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9dc85a17aa386069621fb93c209d58a3/77572819165.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/44982466178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=i+can+move+my+body+like+anything+jack+hartmannPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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