Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a73d7ffe763ae8…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 02:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99787c68b6680328a8d356ee3cf27928 SHA-1: 730f1ab884a9de83e1081d7f740451a9116bfe1b SHA-256: 23a73d7ffe763ae83334ecaca421bc2cd3fe956d18276a22658d463e197cf6dc
96 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to direct users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of multiple distinct hosts hosting similar file structures points to a coordinated effort to distribute potentially harmful files. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609287a1c6409---rekirisusekidajipesapij.pdf In PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/52003919324.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611285e801928---66052297100.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/81917264455.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7182a463e9---43930313636.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/aec30a67af6173c6e28ccd483c655c16/59180227194.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/s5i0gi2ak3343lodg7nnapq6g3/25433284056.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4ccik9cnq007drac3ijvtutfoi/43181887955.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/revikiwunaforexozebunu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd3aae1b59---254387087.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c9f693d0---vitezepinawomamizezipasep.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/locqjmlakjribhh5tajeg7gki8/kepederawu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d031364308---49357610715.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/puzajer.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/kidubonavelezolo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161152d6a73db1---59583785639.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/83f2dc987cfb21d30825afd6c60f1d77/divilazigekefi.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/geresinepinux.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/36201067365.pdfIn PDF document text
    • http://planbmedia.hufiles/14285133377.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a563a066d5b---89612417920.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a84f7f17b5b---keligopepe.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bd580c01e---70958084960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+gmat+prep+book+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_off0000bf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF07 17480 bytes
SHA-256: f2dc8e2eecf6ddb962bb6563acb49836f5f1fc6ab5266ce5b3347f5381b34f2f
font_01_sfnt_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 10884 bytes
SHA-256: 1c37c9491f90a91f02ead8c85b9d1302f557a211da250fc1762fa72098bebe5f

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