Malicious PDF — malware analysis report

Static analysis result for SHA-256 7105cc0f1aa74ab2…

MALICIOUS

PDF

91.3 KB Created: 2021-06-26 06:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eff0ba4bd130b6b29a1ff9f8e9be18b6 SHA-1: 47b751163d891c4665a1ef0299bb758151cf3f63 SHA-256: 7105cc0f1aa74ab2fcec779a2489ffaa074da4ef21f3b63e7e861a4e870dafe6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and other domains, suggesting it functions as a link farm to redirect users to potentially malicious content. The PDF structure and embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5feff21a9---sarup.pdf In PDF document text
    • http://momsystem.ru/public/file/72137361728.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f47c1869d10e41ddd663cce59ff1e425/70232999371.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/oevhuj9nf9q6sf60l9eqvgh1q3/99165587607.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a688d69fe06---taganativitukanamew.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/90466306947.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadb207c33---59712385877.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0f34ba3d3---nixamadoxelewetowam.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798d054d9d1---54850526730.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/34267744890.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/61079918651.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55f80bc9e6---nerejetubebogorako.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/72581930640.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c98f32c6494---bofukazorinumepekezatiz.pdfIn PDF document text
    • http://pharmnet.cz/ckfiles/files/files/kotujimafajaberagazumaxa.pdfIn PDF document text
    • https://mauspro.net/upload/files/22364796582.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/3039570974.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e87c169cc1ded690dfbbc4d25efcf9a2/jesagaxexorax.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac27037e17b---kepub.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/61070648336.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/seluwedatamiwevoger.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/khl0o0qhijogmatflvqv0th0hd/lujakoruxula.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/xogezedoxutirofunubu.pdfIn PDF document text
    • http://canadanur.com/resimler/files/65862926135.pdfIn PDF document text
    • https://aneri12.eu/res/file/93825947050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=all+the+best+quotes+for+interviewPDF 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_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 17652 bytes
SHA-256: 192f3017ec6996b149b21b1792f69a7e3bf479baf0ca0b85153bfd014fe1f5e8
font_01_sfnt_off00012f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001473e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473E 10668 bytes
SHA-256: 043f695f394cb49cb4ec2c7a72caf13a7d11b9e629e776f85a4ba24b614b4457

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