Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58582088d443494…

MALICIOUS

PDF

86.0 KB Created: 2021-08-31 16:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 270e575d7d62294b10f1d44244dbae1d SHA-1: 43c28e446194f89f77f1835756fb4222f9260255 SHA-256: a58582088d4434949de3e0ffe46c0b1df09db556d869caf548b31d3e84dd11a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, strongly suggest a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=handson+machine+learning+with+scikit+learn+and+tensorflow+pdf PDF link annotation
    • https://flyags.com/editorResources/file///dujodapomisadujeseje.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160839525f0b78---runiwetozazemodol.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/wasumikenemiw.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612736014c8ce---tadizemixelowedifi.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/45103076575.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/2438818038.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/14f701c791ad9388444e8d37303497af/botimilizibojagebet.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a126be8b80e250cd67d69d73ecb12eb1/42886528513.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/62926139045.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a6439cb1---jubiwevidiwuf.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b715c270---53446235963.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/mubodotogikovoxotoju.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/94517453413.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/ba05a660d998d3dcb3394d34e53fc675/10904298393.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/boxavefulur.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce52be9ca8---joriwabewomuxesunome.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf526322f0---40338445924.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zisiweretiwuroripopi.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/291923419979.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607191e34264b---34405248040.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/6236420405.pdfIn PDF document text
    • https://renault-service.com/userfiles/vadawuso.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/11339367265.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/43107209652.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_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 18984 bytes
SHA-256: 5c588a48aaaf5f98e2684a7aa85b47f41d5df8a48bd6ca7415d2b57a15da1223
font_01_sfnt_off00011529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11529 11236 bytes
SHA-256: 0dfb7c8083f43af1261e154bde37b540391ca52ea729b16a17d6f9c5b32ddf81
font_02_sfnt_off00012f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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