Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e309f758965a98…

MALICIOUS

PDF

88.7 KB Created: 2021-08-09 14:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 442e748b0b4dcf89dc45a23f73f225fd SHA-1: d2b0848f0fe69f1e7194040f505b17a7ae62d6e6 SHA-256: f5e309f758965a98c98f1a55c9617b3d8a4aafb3e023cb78c3a113c19b1a019e
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/81ca8303972826fd54dc3e59f9b23629/90463895884.pdf In PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2b113e50---bifixuzunedot.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcec7cbbf1---mugewaserokikijag.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e8a01d1b1496e7698f4a143150e0bcab/lofetulixibigugeridolu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/766ac9gvasg7hfvb6kor6krir6/45693667794.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad48222d30---18794268496.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/4238150705.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/vulup.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764dcc5276b---63484342009.pdfIn PDF document text
    • http://meskerjager.nl/media/files/70814055825.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ba11543eb---66131872936.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/84239092577.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/naretevatadozuxe.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771c83d16b7---kunukefojuletejojuwojoda.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///49705957603.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/zexelumurixijasumelisipot.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/benoxenezaxizemutobekawo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faaedfe03df---nofutozomuvolezulubi.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/kanotenogoxabotadisowege.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/pimasada.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/5420056f56db533af96f0313cbec1794/94073537856.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce899a367c---51336463954.pdfIn PDF document text
    • https://phr4u.com/files/bolorakalesufadekoveg.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c91baa323a8---nosewobi.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/5so1eq52nm7d028i4dsm2pcm40/nenumolalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+into+a+gta+rp+server+xbox+onePDF 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_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 18092 bytes
SHA-256: 3fa69ba68afa9563613173d4d64c08c001f4aa1001fa7d7dca32995fb2e65a7a
font_01_sfnt_off000121ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 10764 bytes
SHA-256: 0cffcfbd3e03f5b45e8bacffc9ffd8d51441e3818b3b544bee2922d578d80f1c
font_02_sfnt_off00013a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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