Malicious PDF — malware analysis report

Static analysis result for SHA-256 747d27a128765776…

MALICIOUS

PDF

89.2 KB Created: 2021-07-01 22:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 351d5f85dff254bb1686045035a7fddd SHA-1: 094594ba9407701cf97aa9a1e19a8a816c14d6cb SHA-256: 747d27a128765776f0f92c63a4382e6ab6fb5db24778d19f25e6cf7380dddfe1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest the document is designed to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://searchlink.org/userfiles//file/98387142932.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d7535cdbf---gabekonatojerekog.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1ea0542af---30443930789.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/sudib.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/87938278077.pdfIn PDF document text
    • https://codecs.ro/images/file/jarotipaburatefofag.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a99d7d1a984---18211537784.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/67590047672.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ec67fb16851c080ae5f6792eccb3157f/titasilarigutu.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77944569113.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebbfdc1599---9681391360.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16095a0384592d---93274204366.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609038863cce5---kukurowatibodezex.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e2f4665b7---favadidiluragogeregazeza.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/tg5trb97gqk2hg7mnirdgaak17/55082834749.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/42470516978.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e392cc1372c5eec0cd56ffa9b6800f9a/76365969161.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/rtnkanu0pd1d9rniqsopajjhgt/zakubataz.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/mevefagibasubarutaxip.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/65ab8b1145a377b47cda3aae506d368f/51722711225.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607222ef29764---zowazizetokodi.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8844fc2b52c7ea14b6fca431b1df2f3a/40019898228.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/9d09137042b790642f96c829e59d8408/wejov.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ke1d9p5umr1o2e68kq4tp636j0/84743023162.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4bc6b6ee8---jerudu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3de589254c5064a04f74c3d3ad31cbb0/beraxafefukax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+has+your+education+work+experience+prepared+you+for+this+position+best+answerPDF 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_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 11296 bytes
SHA-256: 58801c79cac015e8c80d8e6912773cb43a14b28a6d58cf71e3e6eea0dfe40929
font_01_sfnt_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B98 16540 bytes
SHA-256: b3d0fd823a136f63903f1c8ed257d7e0bd9991c778069c8c89799d9e394ee496