Malicious PDF — malware analysis report

Static analysis result for SHA-256 575244fe32d0828e…

MALICIOUS

PDF

87.8 KB Created: 2021-06-25 17:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3d8780dc8e50096891f62b867218f64f SHA-1: 57088ff9e09e29b0d29849290ca63107b90db3d4 SHA-256: 575244fe32d0828ed4ef50404d4343577a1cbb8a1a8d9b3980ffac9ed42d8ab8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common tactic for SEO manipulation or directing users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa6295de6---zomuxopototevorep.pdf In PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b091123f9d---pomelabubejo.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c520eede5---melukadowiduvudex.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ge8mj84dfpnds3dm14dnlpocrn/57546464210.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/kgjmo1m1regr4qsir1b8pm9l2u/teketeluju.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6ghpb3r3p21n0it5v9ebmn6rac/4988942703.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8217def82d9c5755198bfd5992be6a45/kifojinegatatutijekifo.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6c05aeed005d299dc4df7735fcf72f37/likavonined.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/gawevajesok.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/38519030030.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/gdur6fj6kl1qbhrfej6muuss1u/50732830559.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a83a3a4ae84---zudagusumogurugoluzo.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/gowilefexalosijukeduti.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/8ba74c75d6e556b41a318cfef6383cc1/69343698721.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/pasozugeganilafaxowi.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/fe30gouprusgtdsm66n06ccm1i/pemidupazorune.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50c1bce93b---88970110362.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16088d1a1a6a78---42170790779.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085056a218fc---66390919283.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/josinox.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc54beb3a2---48755623312.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/36aaf6b3a96e49b1cfdb4862369587af/vinukubidixemufuw.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5a41d985---ribitobisumikid.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/nexujefuxo.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/lidosifo.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/15062f5fa569f5f9792815bee82bd076/vixevufebagiwezo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607038a139bc3---85183778368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ps4+disk+ps5PDF 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_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 28144 bytes
SHA-256: 9232dbb819f463222645c911dfc2514edc9e1781adad8d5bc40011f7ee3c82e2
font_01_sfnt_off00012280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A96 9928 bytes
SHA-256: a69fb5c500e97ea57ec2c7a1b95da607ceb5458f1ed22a06ca33524e1a24cabf

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