Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5414f1e78f7e925…

MALICIOUS

PDF

92.8 KB Created: 2021-07-30 17:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 78c565a426b7e0d7f6a22933f29cb1ee SHA-1: bfff3fdcc77844c5afa87de92afaf4c1d0b05a37 SHA-256: f5414f1e78f7e925494e9a8922c9f9d750e449d37d62f078f76daf69d45194e8
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://www.maderas-navarro.com/ckfinder/userfiles/files/69047641330.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9510f7fdbad9a3d46177fa61037d0624/75103483342.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/p8s95n29a1kqkdcblprk69od6s/vikozusazewa.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/88018445563.pdfIn PDF document text
    • http://duralinealu.com/upload/files/misatusukibipimom.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/13977686402.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a599e919a20---75539289699.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/timugigimokizipej.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/rhvh14iclgrv26bv7ci2lnbvn1/10948927347.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///fevugisasurosezazusip.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0f0733621---revekogadevudi.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/89h1kst95qk1l86lkqhhoua5b0/makozinufiw.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/mudibiwofowowejavajur.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1c7e2aca8---21609911076.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ecb0733aeb877899c34225ef1043b9ef/jajaxagedilujifamoniwe.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/lotitiro.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/fc5edd1e2c28c35191125c6becf8208b/12982485579.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a634c71d79c---33930430511.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906b707d970---72466849232.pdfIn PDF document text
    • http://herve-coiffure.ci/files/nopogifimoxebafula.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16088f87201242---34259404700.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d37f7853dd---parigajalaxelumafepetiv.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cedddcf080---tevawipavijoxaja.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/hioj32vc212ev89c535fqq3igj/37121788959.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef800889f0---xulilagekezeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hoja+de+vida+minerva+1003+editable+pdfPDF 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_off00010518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 17992 bytes
SHA-256: 7ec52543fa71c80b6f3baac10736647b48b2189a52fc85f42f29d49169a94f70
font_01_sfnt_off000132d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D6 11164 bytes
SHA-256: 4a98b61ad6f7b82e58c71ac4ae66a62e3c8ae5ec68d1b62b490fa946ccf6c942
font_02_sfnt_off00014ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1