Malicious PDF — malware analysis report

Static analysis result for SHA-256 1052cd16e63185d9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 01:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e3785db30ef549c0af5d947637b06f6e SHA-1: 92302e142fbf9e676f1bc3528d55add84e2f1d92 SHA-256: 1052cd16e63185d90eabc894b44b963a8bfa0a97b0606bd6d4a14fb9186e4883
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also functions as a link farm, with numerous URLs pointing to external resources, many of which are hosted on compromised or disposable domains. This suggests an attempt to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://callmarkinvestments.fortunekenya.com/callmark/files/20451795530.pdf In PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e98220a9a4bdd889fc97fd07b2d08e3d/nubadotidowetididudomebag.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/92230489143.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/dowumosamogulabod.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/62650186918.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/27d8fd7121e6dfcd157fbba88e69e88e/gisagesugawobejopi.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/majavuwobivazufikosedimo.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/porowur.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135a383502f5---16985969116.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/15691730668.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/mupifuzete.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/mebafojimaxuruwerir.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/2785704179.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/bolesuxetugeboletoze.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd60e2bd9e---9836391555.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/60319402284.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/botujovubukutenikewuto.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed1c4f6e9---19022676251.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/9558305738.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/22529780927.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/59567636329.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/50935129605.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/rewolopuzudemun.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/gexusezusurana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=unlimited+money+for+kick+the+buddyPDF 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_off0000d811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 10864 bytes
SHA-256: f4bd0e726e7ff9a0f083485ff5b3346f837f7a465ff12b1b8fd28cb884ad8a42
font_02_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 18536 bytes
SHA-256: 6e9f92b9889609bddab33f692feb3d2fd0ccf28587a29c6458ce53fd257e16f3