Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68b08b6b90c3f25…

MALICIOUS

PDF

70.0 KB Created: 2021-09-06 00:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1f5918716b8daa9292d0337457954ce SHA-1: e58a265cc9e955b1bad55dbecce333ef878efb5a SHA-256: e68b08b6b90c3f25f3dfad8b5d99b199ea64cfc62a1ecd3052d10d1b840d6be3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to redirect users to external, potentially harmful sites. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=installment+sales+contract+pdf PDF link annotation
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071de386b28b---2501988490.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/jogen.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/18531041001.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/78104559300.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/852275353.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8e1eecb2f---rawemewepevuwavo.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/lavigepewixamuvavodunavek.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/324505321.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/24bf99585aeb13a33a4a61344cda9b85/86313487949.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/15d038a3dac20d3f333864b5cb465bc3/53529369958.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/77030202593.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/73067921603.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1c0op4skpt5jriknvoab9a88cj/fadubazoroz.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/j9gh3n5pcue88aibnh1b14bvq1/69312309863.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/edd1qltqgpkjpf8dnil3ma45q5/49173369508.pdfIn PDF document text
    • http://tercovci.cz/files/file/suxekizap.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/44650827997.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/gedexotexulejile.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e01cb0446e7d6e0a5d75ac5f8de3322c/12087207133.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/movilonapovevevomideler.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/dopowusetamuvagusobema.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/15652288826.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/jozazisobafekisel.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_off0000b495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB495 10640 bytes
SHA-256: bd3e0e552eddf6d136e77efd60150e59fa3b376e88e2671ad444e0e5eca6994b
font_01_sfnt_off0000ccf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 14888 bytes
SHA-256: 953a6d3288c7ef1fa6961ae0fd4dab829ed8a4e894277243506f04ab67e966f8

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