Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee8c9effd7f164e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 10:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5a06817066fb9c39e5fe5880cff8e973 SHA-1: 190a36b38738714f016f0bb1c2bc5a9715bbc9df SHA-256: 7ee8c9effd7f164e5a89113c1e50e14c7e65c2bf79cf61b76ea021707e523ba6
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the presence of multiple links on disposable hosting suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific intent beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://detikakdeti.ru/img/file/mameriven.pdf In PDF document text
    • http://kruengrangthai.com/files/files/14152108004.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/71178677217.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/82490111521.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/m2qgfpke9mn19snv190qseo061/sunobolatebiveselanidexol.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b946c7f05a---rivukosadozogitodejovixe.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/fanekabagonojuvikojo.pdfIn PDF document text
    • http://turatabor.hu/media/sexatixuvuwurukumaxafer.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/23490048307.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tumexaxopanuzemivesexa.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/33685949789.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/8016441441.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083005391a19---tesiximiw.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a9bb44f6---59910961276.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/61635903241.pdfIn PDF document text
    • http://gdaniec.com/upload/files/kinurulif.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/82954553257.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/farogevusidulo.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9cfc35a89cf267ae5aa30bbfbe2f6166/26825565721.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/2f5948ce34be516433f35faa16e58031/28817763577.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612c0025cfc9e---76704023373.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/1539942710.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/20623737571.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a0276c9195c---japaj.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/xakivowipuzub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=lego+mindstorms+ev3+education+instructions+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_off0000ca8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 17980 bytes
SHA-256: d0cf45c71a204a7dbcbc309347cf3840723126630ce9ad53cc560bab3a55efd0
font_02_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 11212 bytes
SHA-256: a24d28f39139bf1baf810a8b416f51008a0bcd38dfe8b07f3aa41475b0c1764a

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