Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd442ab681d3bdd…

MALICIOUS

PDF

100.4 KB Created: 2021-09-05 05:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7296430f8bc0fe6e053a55f6e3fba2f SHA-1: 9b08e94e7fb4b7cf35b55bf034f7bc91602f5a6a SHA-256: bfd442ab681d3bdd7b4b84e0f2cef0a47b55b476bfb51ab14a55693e74a85cb6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/je2ht9g00bvspq4d7f2i5jl041/29394891532.pdf In PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/miwuwuxemagijiwom.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/kuzeba.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4620610b---83838635402.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93d03d82f8---5870702530.pdfIn PDF document text
    • https://service-panev.com/userfiles/40622508034.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1e26943fb2d833aa431226f1fbb9fe69/76009398765.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/4c8dnol59l14qo0gqua7u5nps4/pofabupilonudotiweta.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/36493976126.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/16431919497.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210602143315.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e8ae5dc444---72791615581.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0834957f08---25062392996.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/25432356510.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/44604868518.pdfIn PDF document text
    • https://dragulf.no/files/file/wudibisus.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9faa68f26f65db94145a0053d209df58/62819818456.pdfIn PDF document text
    • http://srutimusic.org/userfiles/file/98098058759.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/xivapawugodijijotogaseg.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/2d5c5a7d8903c1f26de619b6a378022e/sojobavunisogip.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/65131741357.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/37469572618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=kuhn+rikon+cookie+press+manualPDF 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_off0001225b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6D 18804 bytes
SHA-256: cd5f12f3e160d0513a77172ec77fdd9647d6d745b91416c229b18b88d54012ac
font_02_sfnt_off00016b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B83 10724 bytes
SHA-256: 8e288808b885b5579adfdc6986563804bef9331146019aec2988e3939d826adf

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