Malicious PDF — malware analysis report

Static analysis result for SHA-256 10180b3ea74a2c82…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 22:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 302a283e7c16592735f1ed78105d9878 SHA-1: 4a67566020c848ccdfc3ccf5eed84d9457a00543 SHA-256: 10180b3ea74a2c82a8aeadbc19abd207aef1459c6eaba3ce1e989f1c0905f3e5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS upload directories. The ML classifier strongly indicated maliciousness. The primary purpose appears to be redirecting users to potentially malicious or compromised sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cravaluos.com/ckfinder/userfiles/files/51277642751.pdf In PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072f5d38eda6---24089885084.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/fcc8b91429fc7fffe5df65f7662dcd72/popalopizafokujiropopu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087329e85e98---78302389449.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/rutuxesotosoratazibe.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/xamateregetaxawipivavomo.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/70340450318.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/61736624361.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bdec8556---kibaketiwutupu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880127a8f47---mawigubopowazusosebo.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a64faf0c0d8---94556328388.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/117e551d7782c96edcd4924f473b4245/nidagakuxogulijewupolo.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/p4pm0qko9s50ea52rr8q5hmn60/91101579476.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/46070963825.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c43459ecf5a---58380222889.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/leluviledo.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/38340288857.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/89670929077.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/numalizarosodev.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/26140735436.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/22771528522.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16080a648ba942---nilanilowiju.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ed96efb7824d6fc857234cc547b5fd79/66922426822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sumber+daya+manusia+adalah+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_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 17272 bytes
SHA-256: 1c64ec6f16695c30b97df52f045c86a111b172fc53643a842c01a7cc97debf38
font_01_sfnt_off0001175f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F76 10976 bytes
SHA-256: 6a37c40564a30e744c8edd86427cb3a43cba561dea3349078feb60273ee36a92

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