Malicious PDF — malware analysis report

Static analysis result for SHA-256 883c6740a36e8d66…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 21:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3c3cacef3aa3224886b04d74644bf7e SHA-1: d1455f9a013baffdaf5d0eee3f5342ef71547871 SHA-256: 883c6740a36e8d668e5765fadce28754f1860360b0458caf7ed0af405466b7a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://huntic.ru/uplcv?utm_term=estudio+de+caso+caracteristicas+pdf PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5107f5753a---81514999570.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/vojiwafuminekaxixikoto.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ovliccf07sd4fnkjthoik490dl/pakawokopofagulurod.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/99465825870.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/fe37k1ec3ba1lttbn4hctuj2cd/30805033304.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ea775a5f---tagedalemud.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/fao75f0rtbtr3pdqd62dkum3j0/bipozisajaturijeriruzusiv.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/1284486600.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/39752537145.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210607_EEBF835A87FCFAF7.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/tefal.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/bokewujeg.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/1057315575.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/26256195298.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/49c8bd69c540b8a48ea77e59daa8a551/toxepisidivejobufegesudi.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/63665814359.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/79555015080.pdfIn PDF document text
    • http://sbcnepal.com/images/file/vutumozumosiba.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a1f3e6eb2cac6519abae8e0332319d58/pirolikirivupi.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/lorifetetenojojom.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/28685931416.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4af38b496d9ec1428c7e86d572d8c615/wasoxivi.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/17638170196.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc5194263---vovavirix.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/40840328178.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021892253497339.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/95901959235.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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 21936 bytes
SHA-256: 86dcbee192d4c9fbbda10b06217de77423e74ec8c4f425db9ff2dd18c1ff460b
font_01_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 10544 bytes
SHA-256: d17661d6b9bf8d15f1de46c4b5ea45fad511bf6c106027c6576648625e078df1
font_02_sfnt_off00012d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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