Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c71bd058a12faa…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 06:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 35d8336fad097825ef12fe96d91a45b3 SHA-1: be00fe4f9e4546f7982a7cd06e1926b0ca8daec8 SHA-256: 80c71bd058a12faa27262ae67996b86ecacf8d6198e65c907c46d633c1a8fcdc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The PDF itself does not contain readable content, but the embedded URLs and heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b11113bb6e---mebafolasobasis.pdf In PDF document text
    • http://nusratali.com/userfiles/files/giturulamezomela.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/pilipenuro.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/8591069148.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/94956242235.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109201209023791.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/26c218c1e35c3e24597e0488f8246e76/42457806600.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/0sddgeljk48sqenh33669970ra/zilati.pdfIn PDF document text
    • http://parentini.it/userfiles/files/20558185752.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/fawikinofak.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/wexaravebuzalig.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/83646032641.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/58192849971.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d69026855---gupovabunik.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492efa42b95---kizapiripumebofiwovuv.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210911174800_1587717672.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614a309bf14a0---79048080683.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/20118404887.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/38516808323.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b8e4f45325298c070a386df1e0d5a0eb/44733048743.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/xebanalorejeponosizat.pdfIn PDF document text
    • https://pecsikult.hu/files/file/jepujilokepadigo.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/xigijib.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/nonikawobugajole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+more+storage+on+androidPDF 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_off0000b527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3E 10620 bytes
SHA-256: 062a683bfe66c56aa1406872c397176281ef61c9fb9adf8e5f8439828efc68d0
font_02_sfnt_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 15696 bytes
SHA-256: 1d01841038bcb4ca8d7b6a3eca7d98b4285383920ca180ddcda5f1e660db4d6a

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