Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa10e7fca7f5064…

MALICIOUS

PDF

101.4 KB Created: 2021-07-04 01:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52a8b072f67cc89c5bc763e0c11988b5 SHA-1: ce6edea39fff95debb0a319d1213fb9bcf17b65a SHA-256: 9aa10e7fca7f5064d5e56569effcd9e0c2b1713e9c67b87467ed696999932383
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://synerhu.ru/uplcv?utm_term=set+for+life+prizes
    • https://biogenetixpharma.com/ci/userfiles/files/ninesonavawejonawiba.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a958e5638a589ef3404b8bf14ebecd28/barijewowilo.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/516bb07d9ca94946ca6580e95c9f58c8/82609030168.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160accfbf5bc42---wowiwigumowusovofiruz.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/69077180425.pdf
    • http://candientuvibra.com/images/file/59321566695.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/bf0f44c7fff32800cf79532ac2341c60/nifiweneporigo.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607533970799e---58904235855.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/tpkup9t7m8gpp873rmt3q24pp4/31180338870.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/84ab6177183630c90f83626a31df4477/berixexagavumeripu.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f3ef670c028e3f5afa26e3296335a02a/valituxoxo.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607570df33d81---46763301011.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/27625927397.pdf
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/82007474128.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff5bb6fca---bazurejutumajirub.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/btp2qprhejat5hcqglccdm8oh5/mumafitulalejedamugi.pdf
    • https://akproauto.com/nbloom/fckuploads/file/taselirudeseleranakab.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8c9a4bd77bc52c8c5beb0b1e5318bba9/wesajimobenibanakobol.pdf
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/88194287130.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e018adf4146---tejoliwufebuwevixopopate.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/05c31ee9799ca7559e38fd9e05b3de9b/jenejasibi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74370ab6c8---fefoxisozu.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f05cf7c88a---38564388539.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b85c90c5f4---gatofamevududevuwomilitex.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_off00012ad8.bin
3d3fee666d14a497060a91f76daeaf5ef23a41b44c4ea30077c11e20504564a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD8 10220 bytes
font_01_sfnt_off000141e1.bin
64996066d6c8aaab71e713c5489aee5a2af7572e9098928db37a70255d2080b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141E1 17752 bytes
font_02_sfnt_off0001704d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1704D 16792 bytes

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