Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0eb010d94f1914…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 04:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a12da362890fd0fbc1d33e39a8ef9253 SHA-1: 90975dc557208a18a376a879195e414be0cf264c SHA-256: 0b0eb010d94f19146b2f972f1dd56e7782a9d422b999dc43c66f3a5d9cf791a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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
  • 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 http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/26186227688.pdf In PDF document text
    • http://goodtraefarm.com/ckupload/files/xemewofiraruposugaviled.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466ebadd2f3---fekolawonaris.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/93883464591.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614081691b42d---furowuv.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/nexesula.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/gepinedugumodew.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/gizojefifegikede.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/49045783567.pdfIn PDF document text
    • http://specialcats.nl/media/files/53502568562.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16145a4b0403f1---72382399092.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/31271186174.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/norenaxoxijap.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/21873885555.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/favijoponinaniju.pdfIn PDF document text
    • http://vodova51-53.cz/files/vinetodugixatuvobezor.pdfIn PDF document text
    • https://funbugs.ie/files/file/73492141477.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/1529737271.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/71384731683.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/nodaxerijagunavod.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/lalozipigamirubomozujigot.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/56403577051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+sync+my+android+phone+to+my+laptopPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/selideg.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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_02_sfnt_off00012f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3F 10968 bytes
SHA-256: 49214cf3fe3ba8cc35d53950dbbf35bc2cbe032a0ba503703c1219a1f02d726b