Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c3dc1522ad04c8…

MALICIOUS

PDF

89.7 KB Created: 2021-09-04 22:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8a1723f16307dcb662f95a1fc0a5734 SHA-1: 5cb66bf02cb4fc08a712c09c9c13133fd75913f5 SHA-256: 51c3dc1522ad04c8055accca0bd47e8dc67b93a92dc8092085d77b3dd69a5a2c
96 Risk Score

Malware Insights

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

The PDF was flagged by an ML classifier as malicious and contains numerous links hosted on compromised WordPress sites. These links form a link farm, a common technique to obscure the final destination and potentially distribute malware or lead to phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt at SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 5

  • 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.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c15f0da8508---46053164883.pdf In PDF document text
    • https://charming-dc.com/uploads/files/202108141141385021.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/45871524750.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/wukefuferazezeroxowevun.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/e01d5e40cf1afbba133f22f46c3d6134/werivuw.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b61bc139d0---95484751082.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202172921512568.pdfIn PDF document text
    • https://estoniapools.com/contents//files/87572449463.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/58336970343.pdfIn PDF document text
    • https://shidoremicrosys.com/media/30764228918.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f9802b5b6---wazojadexogujudagagi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/tkk3emsvlcobjmqb2fbk4o23v2/baputedilebaxoxatatiwupus.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c729ab641d1---28348530635.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9e40c8e80---20117779425.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/84cb4930608aeaa860a3398ecd89110c/poremesabopuxegodom.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/witimij.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/c9de7f4e485b41611869b1ad428f0d8c/powukibipemulaponeja.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d388a8d97b2ae077ae2af9d8e516ea00/zerip.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/fewavitafiduj.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/nujuxidefi.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/dipixejugaxe.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608485801ab46---tuwazeb.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f132cf5a659c7d2b7f86462e99347fbd/11809052617.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c003ed5116c---22766085058.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/95664740441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=shraddha+suktam+meaning+in+telugu+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 20832 bytes
SHA-256: 4c7b8df068b60a38c3de8a970b681a1f54d61446020dd9669da9440d37cebead
font_01_sfnt_off00010ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA9 16344 bytes
SHA-256: 03a64f75da6652b208e5ecc61aa5bb58585c18d510927d4000d6fb9dc15321ed
font_02_sfnt_off00012528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12528 11092 bytes
SHA-256: fbc3f1a1e529a3e2ace01bf5ab4eb7ef70c49c1fb629889b77f7163d26ef46d8
font_03_sfnt_off00013e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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