Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd42128891a3d508…

MALICIOUS

PDF

97.8 KB Created: 2021-09-23 07:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60373dc09acaa180dbb896f92309f6ae SHA-1: ef0f0963e884c95b65fa30d645e8b1d2c2215e9c SHA-256: cd42128891a3d508005b2fefd922323a6d321c114b093685248a2c88e7ffadac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pmfegypt.com/userfiles/files/42076985543.pdf In PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/dibetuwobigiguzezari.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/46528944508.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/dujefidowij.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/7059939827.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449fd5dc973---ronevulag.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/nutew.pdfIn PDF document text
    • http://grimastone.ru/files/derugexoxedit.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/bigubuzojilubedarar.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/xewuxekuxagib.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b2f9151e4---kimajitaveri.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/vanatu.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/72716294098.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac89c536a---zutix.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/tokuletivuzugajebulemo.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109220900244534.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/74495790154.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/dunesolibo.pdfIn PDF document text
    • http://art-ball.net/files/file/jabaxam.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/78551799160.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/76543439241.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/59917637680.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/28947322174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+adblock+browser+for+androidPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/15629350877.pdfIn PDF document text
    • 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_off00011401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11401 19928 bytes
SHA-256: 9481055aa70f9354f6764120f1ca0931e8ace892aa1516dab5519008924ab181
font_01_sfnt_off00014800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14800 10840 bytes
SHA-256: 2254be4c1111127ea5d0bfd115b71061ac852b31b6ee55ba87e424ab4930fdfb
font_02_sfnt_off0001613e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1613E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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