Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d8773973f048cd…

MALICIOUS

PDF

138.8 KB Created: 2021-08-05 03:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f159800d428c3042ce3b0cd3f837d2a SHA-1: 624bc1e37936ff8d5237013ca6a6e186716f66cc SHA-256: c1d8773973f048cd19308f4ea85eb7e42caa44cd47b1709d2f38f645ebb2be4d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic findings point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://smidgel.ru/uplcv?utm_term=kriya+yoga+postures+pdf PDF link annotation
    • https://securityguardsupply.org/php/uploads/file/xepavonofuzo.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/wixozawewunedazaxe.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/0t0d6jjdjbfgt55637475vms85/sanipirewakitoji.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/nefafukujigamurozanijil.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/8b42395cf8b750ffb094c55efd39e401/jogelojozodezudud.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4hkm3u8aih5rblloutakvtuj67/nabidez.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a1d9d5fa---74313697926.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6de551d505e9ee6a523be1307b5eb572/91835711074.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/128a652fc2c58d6ab0c703b58aa359d5/90562545964.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/dfefc364960c74c16a9f2fd2880b2c84/xuwukerif.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/pmihv4tuibmj3hlrq1ufp8s4p9/vubonamusapunud.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/30077934490.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/18459047653.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/42441098747.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/tenenupebelu.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/29613918027.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/lazup.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/cf59f1429386fd94438c966e54a38c25/vubozit.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/gk2eebaobv0jjf5058i45ul0qm/89118865250.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/69324794341.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160827e015bc33---nevasisadilaz.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/566f5f7dcce626a27606f6a93a1625c9/72915080632.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/58886633196.pdfIn PDF document text
    • https://aokman-drive.com/d/files/93921889555.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_off0001baa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2BD 10728 bytes
SHA-256: 214073f4e04675ac54906b09fcd9ea18fc18a8c2dd58ba393e9aa9f0fa2d0b27
font_02_sfnt_off0001eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB5E 19656 bytes
SHA-256: 41a931e9ee001bffc65c4f44c013c7cab7beabf09df037667fe0ec507912eb3e

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