Malicious PDF — malware analysis report

Static analysis result for SHA-256 398371dbdd8c9d73…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 00:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c54bddb563d2725cb8bfdf994a2545c2 SHA-1: 24a2b34621495655f5404aad5c999587b36f4e84 SHA-256: 398371dbdd8c9d737b0726025dcb79427ffaa0b4deddf5bc21b059d8ae1c6779
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sewakendragroup.com/userfiles/file/fovimiwef.pdf In PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210622175009.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/doreli.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/38577283874.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/4760003781.pdfIn PDF document text
    • http://yuha.be/_files/file/xovupu.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/kepigezenomolurorida.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4dd6d3bf562b397d6f636aa598b89921/915044555.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/45656474198.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/35626543632.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba0234f52---suvudinafizipamovufosow.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b080dc7450b---zizikubuzixad.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/46u63itpgrk570id59q60r7nak/tinixidajepiropone.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/s0o865t66msu54hi2pgoljcut7/767506594.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/83684446992.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/74450707381.pdfIn PDF document text
    • http://uco-kampen.com/media/files/78372044353.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/34668880099.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/32965071642.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/bufozamirarunusu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f3d822d14---23774788509.pdfIn PDF document text
    • https://dineflon.com//files/giboriwufutux.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/bovuxabobutasuvinovowaju.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/989157482f87873a0ae5b88198180593/sasisume.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/kanibupugib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=worst+states+to+buy+a+carPDF 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_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001041a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 10328 bytes
SHA-256: 0f74cf6b88cc5b6fb1291f1e99a2713f3141903a8aefef8e4c2ab6803728da25
font_02_sfnt_off00011ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA7 17576 bytes
SHA-256: 11b14c699d7e969ed7f32a226a0967d5a0a964c369b6476838fc0ac5654f1695

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