Malicious PDF — malware analysis report

Static analysis result for SHA-256 572f2943c2442fd2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 03:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 031bc4c0b4c9e53e0988ebac28cec0fd SHA-1: 918dc50fced940283600352016a159c44cb7a24a SHA-256: 572f2943c2442fd2f64e606ad0e6fd4407c4e32f6abdff56a5a509b35ca064e5
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier strongly flagged this PDF as malicious, indicating it's likely part of a malicious campaign. No scripts were extracted, but the structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://uklearningnetwork.com/userfiles/file/rudanoxalawidagemefebaxa.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ed6e413ad76b6466b050ed600d261f61/lisibezuzebamajijinu.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/7i1t1c1nct3lnvnviobihegmfq/25904376767.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0752ceb6---97072090398.pdfIn PDF document text
    • https://vayoto.vn/userfiles/file/ropufelonotaka.pdfIn PDF document text
    • http://toonesk.com/upload/sekedamufugaxuw.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210628124412_d0sl0d.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25efb8ac0b---degufirifudi.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/58681627959.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/38731308438.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/jazexakama.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f052f00e2a896f3eef5e71f8efd65a11/nedagupokorobemevi.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/75966684072.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/ca3d642d48e71859b0c390844163373d/76357616588.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/77692688368.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/72066893039.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161172f0a2d4c2---xadifomujevavub.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3c2ad5bc6f5874364b6c26ed603fbf83/61749861818.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/ligogowiviruvavatoxetipi.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/vonire.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/3433469055.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160847d799051a---piwavenamesiwirega.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608ace7a0ab95---69582569701.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc628b44764---98036155292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+econometric+modelling+of+financial+time+series+mills+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_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 11028 bytes
SHA-256: 713acd0861177c8bd1adb16d5b4d6dd72f06c3ef24b24b18d77727226195e0aa
font_01_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 18388 bytes
SHA-256: 813cc3411d70b346f304b8f37d2941e77d9c4cfff0d1314d4fce2de3aeaefc7d
font_02_sfnt_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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