Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea82ec0c665de09…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 10:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 64b8ae6e906180407e29de4654e90cad SHA-1: d7929b8b781bb7a088f40f1cd264a7ff795b8d9a SHA-256: 3ea82ec0c665de091226a7484fe52f0f6c04c6dd2ef82556b80ec00aa5e7212e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress installations or disposable domains. The PDF itself contains no readable content, suggesting its sole purpose is to host these links, likely to facilitate phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b7a9e1c12---37792423559.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab5d965a8c---dufetunufotavodaf.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/wubajoritaba.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/tamazorujopelofawurumidir.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b37d61b8af---40983031326.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/2682642765.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/33082367462.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/0df4502bbca0d64b1da149b63416099c/42446338185.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/sajagejuvidaratisi.pdfIn PDF document text
    • http://jn-zhsc.com/upload/76740957926.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/jerajegagufitas.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e073492be8da750b5058e87c2bef3139/vokumofojijurunu.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/lupovipa.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/95429190119.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/kofevulifofozonunimul.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070e7e9d9d9d---54593485563.pdfIn PDF document text
    • http://bakoca.hu/files/file/80996737480.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/kflvc32bct5jahvbv0mpj53c11/rigufomuf.pdfIn PDF document text
    • http://allycatering.com/userfiles/85308970672.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/dupivepilonuw.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/uo2te6p8p0qclsn2s1097l43q0/pibavarefimakonop.pdfIn PDF document text
    • https://steammining.com/userfiles/file/wonidegopakuradosodepule.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/e682b578d1b587f9566204e2d7642ad3/nurok.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021081313361373499.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c41b371eabe---newufinafugizezorasoxido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=nouns+and+adjectives+exercises+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBE 10940 bytes
SHA-256: 054b4144d4e18e7877d0a1c8708f803e7ef42e8309e79d2493e6b97fb94bfeae
font_01_sfnt_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 16984 bytes
SHA-256: e353dd5f053c6c64cad73e806c4eeae3063f3937e83ee7f0ee0c854a72a4cc6b
font_02_sfnt_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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