Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a25cb6205e9597…

MALICIOUS

PDF

112.5 KB Created: 2021-06-26 09:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 172a2e6a1a8ae1b212547c8db8ffc4ac SHA-1: 6b5cfde07494d4422b56cef43cd1623c9c67fe32 SHA-256: 72a25cb6205e9597df9289792c46c97209c1d9526f8b1e7990e174f930dcd8cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious content or redirect users to phishing sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=medieval+military+strategy
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/chherl4l13p90bjk7uu4dn3pv0/64553285613.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/4qd3ithr5qbbh7f03g2gsrjb7g/winafakupin.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d468626d02---laxugadedog.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/p17cql1e2ij1s6tu21qaggpo4g/dorunovejirizoropuwivikaf.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160795fd4cda9d---16484646413.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7954f775---ririguvupulaturaviwoba.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/253c1389bed928d93861e73a16452435/midolopopobezubolu.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/57aa522bdc50a343d1d2c6c5380ed3af/linotapu.pdf
    • http://tragadsonisurat.com/ckfinder/userfiles/files/81594005539.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc45ca3c1---99751640820.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cda0c4c8021---30687915824.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/78fc63810e19626600e341f87968cbb6/vulesusagamipazexuxixivux.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/fdlnl1npbl5aj15q0mbsgcrdhp/61173721240.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210616_EF35CE9BBE236D09.pdf
    • http://www.look4job.gr/images/_user_na/file/56585996951.pdf
    • https://edcasys.com/ci/userfiles/files/26349225435.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5gim86d7tm2k6j5cl5u4b1ga0m/84147092970.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/9cae1410c01006be655fdfd2600f8254/19119445344.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a005a8dab72de160dbb4cfe7ca917b8a/bifenu.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/9ffb2b1638522fed8c03a084e9df3f5a/sifokatof.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d3cbd94d---texurumojenividanupuz.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8325690572---25137608995.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160835cbae32a6---zamago.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000155ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155ED 16792 bytes
font_01_sfnt_off00016dff.bin
b88155b68b6c009d35525b80261ecbac7104f644422fa6f99724fcc732d17c2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DFF 18592 bytes
font_02_sfnt_off00019cf1.bin
cf099e4276d400193f0102dbc55a0ca54daa048945601ce9ae72f9563199984b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19CF1 10540 bytes

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